چهارشنبه هفته پیش در کنفرانس PDC، مایکروسافت در مورد نسخه جدید مرورگر خود Internet Explorer 9 جزئیاتی را شرح داد. البته این توضیحات بیشتر مربوط به توسعه دهندگان بود تا کاربران نهایی، اما با نتیجه گیری از آن می توان آینده خوبی را برای این مرورگر تصور نمود.

اعضای تیم IE شروع به کار روی نسخه جدید این مرورگر کرده اند، در حالی که نسخه 8 این مرورگر با قابلیت های جدیدی که ارائه میکرد نتوانست جای خود را میان کاربران اینترنت پیدا کند. این موضوع دلایل زیادی دارد. یکی از مهمترین دلایل عدم استفاده کاربران اینترنت از این مرورگر، سرعت پایین تر آن نسبت به سایر مرورگر هاست. این که مرورگرهای کروم و فایرفاکس از IE سریع تر هستند را خود مایکروسافت هم قبول دارد. از دید طراحان وب مهمترین مشکل IE پشتیبانی نکردن از برخی استانداردهای وب است. وقتی که مرورگرهای فایرفاکس، کروم و اپرا از HTML 5 و CSS 3 پشتیبانی می کنند اما IE 8 این کار را نمی کند، باعث آزردگی خاطر طراحان وب می شود. مشکل بعدی IE کارایی پایین در اجرای کدهای جاوا اسکریپت است. تمام سایت های وب 2.0 از جمله Gmail و Facebook از مقداری زیادی کدهای جاوا اسکریپت استفاده می کنند، که باعث می شود کاربران پاسخ های سریعتری از سرور دریافت کنند. IE با کارایی کم در این زمینه از رقبای خود بسیار عقب است.

شرکت مایکروسافت و اعضای تیم IE خیلی بهتر از من و شما به این مشکلات واقف هستند. به همین خاطر برنامه ریزی هایی برای IE 9 دارند تا هم کاربران نهایی و هم طراحان و توسعه دهندگان وب را راضی کنند.

سرعت

مهمترین هدف مایکروسافت برای ارائه نسخه 9 مرورگرش، تسریع در بارگذاری صفحات وب است. این شامل تسریع در رندر کردن صفحات وب با استفاده از قابلیت های سخت افزاری مثل کارت گرافیک و بهبود کارایی کدهای جاوا اسکریپت می شود. هرچند بهبود کارایی کدهای جاوا اسکریپت معیار دقیقی برای تسریع بارگذاری صفحات وب نیست اما به دلیل استفاده وب اپلیکیشن ها از جاوا اسکریپت و فراگیر شدن آن در وب سایت های مبتنی بر وب 2.0 آیتم بسیار مهمی هم برای کاربران نهایی و هم برای توسعه دهندگان وب است. IE 7 و IE 8 در زمینه کارایی جاوا اسکریپت خیلی عقب تر از رقیبان خود هستند. تیم IE در وبلاگ خود گرافی را منتشر کرده که کارایی جاوا اسکریپت در مرورگرهای مختلف را نمایش می دهد. در این گراف که در زیر مشاهده می کنید، IE 9 با فاصله کمی عقب تر از رقیبان خود کارایی جاوا اسکریپت را افزایش داده است.

کارایی اجرای جاوا اسکریپت در مرورگرهای مختلف

همانطور که مشاهده می کنید هنوز هم IE 9 نتوانسته در این زمینه رقیبان خودش را شکست بدهد. البته باید تا ارائه نسخه نهایی این مرورگر صبر کرد و بعد نظر داد. هر چند موزیلا و گوگل در این مدت بیکار نخواهند نشست و حتماً کارایی مرورگر خودشان را افزایش خواهند داد.

پشتیبانی از استانداردهای وب

در سال های اخیر مرورگر اینترنت اکسپلورر به جز دردسر و مشکل برای طراحان و توسعه دهندگان وب، چیز دیگری به ارمغان نیاورده است. مایکروسافت در این نسخه قول داده است که از HTML 5 و CSS 3 به طور کامل پشتیبانی کند. این در حالی است که مرورگرهای کروم و فایرفاکس در آخرین نسخه خود از HTML 5 و CSS 3 به طور کامل پشتیبانی می کنند. این خبر بسیار خوبی برای طراحان وب است که بالاخره مایکروسافت قصد اضافه کردن پشتیبانی کامل از استانداردهای وب را دارد. البته زیاد هم به این قضیه خوش بین نباشید! در حال حاضر IE 9 از اکثر قابلیت های CSS 3 پشتیبانی می کند اما در زمینه HTML 5 پیشرفت کندی دارد. بحث های زیادی برای پشتیبانی از HTML 5 در مرورگر IE 9 وجود دارد، زیرا مایکروسافت هنوز در این زمینه مصمم نیست. به هر حال این قضیه ممکن است باعث شکست IE در مقابل رقیبانی مثل گوگل کروم که از استانداردهای HTML 5 پیروی می کند، شود.

استفاده کمتر از CPU

در اینترنت اکسپلورر 9 وظیفه رندر کردن گرافیک ها و متن های موجود در یک صفحه وب به جای اینکه بر دوش CPU باشد بر دوش کارت گرافیک خواهد بود. این یعنی استفاده کمتر از CPU وقتی که کاربر در حال مشاهده صفحاتی با گرافیگ های غنی و متن های با کیفیت است. IE برای این کار از DirectX استفاده می کند. این یعنی رندر کردن سریعتر صفحات وب، مخصوصاً در کامپیوترهای با کارت گرافیک قوی.

farasun.wordpress.com

به هر حال چه از IE خوشمان بیاید و چه خوشمان نیاید، این مرورگر سهم عمده بازار مرورگرهای وب را در اختیار دارد. چون روی هر PC جدیدی نصب است و کاربران تازه وارد، اینترنت را با این مرورگر می شناسند. اکثر کارشناسان و کاربران حرفه ای وب اعتقاد دارند که Internet Explorer مرورگر مناسب و استانداردی نیست. مایکروسافت با عرضه نسخه بعدی مرورگرش وارد عرصه تازه ای از رقابت با مرورگرهای پرقدرت فایرفاکس و کروم می شود. این رقابت در آخر به نفع کاربران تموم خواهد شد، زیرا هر کدام از طرفین سعی می کنند مروگری بهتر، سریع تر، امن تر و سازگار با استانداردهای روز وب را عرضه کنند. باید منتظر ماند و دید که آیا IE 9 می تواند شکست های قبلی مایکروسافت را جبران کند!؟ نظر شما چیست؟

Not so fast, Internet Explorer! We know that you have great things in the works for IE 9 — including Direct2D GPU acceleration, the 2D / vector graphics API that we first laid eyes on in Windows 7. And believe us, that got our attention — as well as the attention of Mozilla programmer Bas Schouten. It seems that over the weekend, the young man successfully loaded Direct2D support into an alpha build of Firefox 3.7 — just days after you announced its inclusion in the next version of your web browser. “Things are looking very promising for Direct2D” and Firefox, said Schouten, although “older PCs with pre-D3D10 graphics cards and WDDM 1.0 drivers will not show significant improvements.” And we thought that accelerometer support was wild!

You may have heard of the new Google Chrome web browser. In fact, it is what I am using right now. The funny thing is that I didn’t learn about from the internet, but from Luke Laprasi, who is maybe even more of a computer nerd than me, who always tells everyone his favorite products. I was skeptical at first, I admit. Then, we were using the brand new mini-computers (I just got my own today!) on our Wiki, when I decided to try it out. Immediately, I knew that I had found something that was amazing, and something was going to improve my internet experience. It was simple, easy, and best of all, super fast. When I got home, I logged on to my laptop and downloaded it. I spent hours playing with it and figuring out all of it’s new features.

I don’t know for sure, but I assume that Google Chrome must’ve been pretty popular, because, as you probably know, they are making a computer, called the Google Chrome OS.

The OS is built around the same thing as Google Chrome is: It’s easy to use, and it’s super fast. As John Chow points out in this video, people spend most of their time on the internet.

However, the internet used to be slow, and the computers were designed accordingly. Now it’s fast, though, so Google decided to make a new computer which reflected that change.

Most people, when they turn on the computer, just want to get onto the internet, but the computer has to do other things, which take time to load.

The Google Chrome OS is different in that it is not stored on your computer, but instead the internet. That means that as long as you have internet access, you can access your computer, even from your phone.

Google has said that this isn’t intended to be people’s main computer, and it certainly shouldn’t be; there are important documents that only you should be able to have access to. Because, while it is secure, there are some things that you simply don’t risk.

For example, my dad, a psychologist, wouldn’t be aloud to use it because it has to be 100% secure.

I think that it could be a good addition if you have enough money to search the internet. In other words, you would search the internet on your OS, and do everything else on your regular computer.

So, what do you think of the OS (coming in 2010!)?

SSH or Secure shell allows you to access external servers from consoles and Windows desktop applications like Putty and Cygwin. Wouldn’t it be nice if you could SSH into your server without requiring any client, so that you can access your server from virtually anywhere? Web Shell is a web application based on Python which will allow you to access SSH from any web browser and even your iPhone.

The server is written in Python and is very easy to set up on Linux, Mac OS X, BSD, Solaris, and any Unix that runs python 2.3.
Download Web Shell

Their is a major flaw in IE8 that may deem safe site unsafe Read More

Microsoft begins paving path for IT, Cloud integration Read More

3 Reason Azzure will Succeed  Read More

Con una pressione così forte da parte di Mozilla e Microsoft, l’unica cosa che Opera avrebbe potuto fare per imanere competitivo era innovare. E in questo dobbiamo fare tanto di cappello: nonstante non abbia una grossa market share fra gli utenti del web, Opera è sempre un passo avanti agli altri, nel bene e nel male.

Con la release 10.10 Opera si è spinto nel vero e proprio territorio dell’ignoto, unendo un web browser con un web server. Questa feature lo rende unico rispetto agli altri browser presenti sul mercato, ma nello stesso tempo porta a domandarsi  se questo tipo di innovazioni siano realmente un qualcosa di cui gli utenti sentivano il bisogno o se invece non ingenerino semplicemente un senso di confusione.

Con Opera Unite integrato nel browser il web diventa effettivamente un ambiente read/write. Si possono condividere foto (fino a 10 gb), diffondere la musica in stream, e fornire il servizio di server per una chat o per un intero sito web con il solo browser. Il Team di sviluppo è molto confidente nelle potenzialità di questo nuovo prodotto.

L’idea è certamente interessante, ma il web sembra essersi mosso verso una direzione differente degli ultimi 10 anni; quella della cloud computing. Invece di far girare programmi sul proprio computer, le applicazioni e i dati risiendono nel cloud con la forza di tutte le risorse ed il know-how fornito da providers (tanto per dirne uno) come Google. Quindi, sì con Opera Unite potete fare da host per un sito web, ma si corre il rischio di incappare in problemi di banda e di performance; con Google Site è possibile ad esempio creare interamente un sito web, certamente rimanendo ‘vincolati’ a Google, ma con un’infrastruttura fisica e software di elevate capacità. Così, nonstante i problemi legati alla privacy, il cloud computing sembra essersi imposto come standard e sembra difficile credere che Opera abbia la possibilità di imporre un così radicale cambio di direzione.

Altre feature di Opera sono la Turbo technology, che velocizza la navigazione comprimendo le pagine web sui server di Opera presentando all’utente una versione ‘lite’, Opera Link, che consente di sincronizzare i dati fra più computer, un download manager integrato con BitTorrent.

Per la lista completa delle feature potete guardare questo link al sito dello sviluppatore.

Google Chrome OS overview:

Google Chrome OS fast-boot:

Google Chrome OS security:

Google Chrome OS & Open Source:

Setting Up A Ftp

Well, since many of us have always wondered this, here it is. Long and drawn out. Also, before attempting this, realize one thing; You will have to give up your time, effort, bandwidth, and security to have a quality ftp server.
That being said, here it goes. First of all, find out if your IP (Internet Protocol) is static (not changing) or dynamic (changes everytime you log on). To do this, first consider the fact if you have a dial up modem. If you do, chances are about 999 999 out of 1 000 000 that your IP is dynamic. To make it static, just go to a place like h*tp://www.myftp.org/ to register for a static ip address.

You’ll then need to get your IP. This can be done by doing this:
Going to Start -> Run -> winipcfg or www.ask.com and asking ‘What is my IP?’

After doing so, you’ll need to download an FTP server client. Personally, I’d recommend G6 FTP Server, Serv-U FTPor Bullitproof v2.15 all three of which are extremely reliable, and the norm of the ftp world.
You can download them on this site: h*tp://www.liaokai.com/softw_en/d_index.htm

First, you’ll have to set up your ftp. For this guide, I will use step-by-step instructions for G6. First, you’ll have to go into ‘Setup -> General’. From here, type in your port # (default is 21). I recommend something unique, or something a bit larger (ex: 3069). If you want to, check the number of max users (this sets the amount of simultaneous maximum users on your server at once performing actions – The more on at once, the slower the connection and vice versa).

The below options are then chooseable:
-Launch with windows
-Activate FTP Server on Start-up
-Put into tray on startup
-Allow multiple instances
-Show “Loading…” status at startup
-Scan drive(s) at startup
-Confirm exit

You can do what you want with these, as they are pretty self explanatory. The scan drive feature is nice, as is the 2nd and the last option. From here, click the ‘options’ text on the left column.

To protect your server, you should check ‘login check’ and ‘password check’, ‘Show relative path (a must!)’, and any other options you feel you’ll need. After doing so, click the ‘advanced’ text in the left column. You should then leave the buffer size on the default (unless of course you know what you’re doing ), and then allow the type of ftp you want.

Uploading and downloading is usually good, but it’s up to you if you want to allow uploads and/or downloads. For the server priority, that will determine how much conventional memory will be used and how much ‘effort’ will go into making your server run smoothly.

Anti-hammering is also good, as it prevents people from slowing down your speed. From here, click ‘Log Options’ from the left column. If you would like to see and record every single command and clutter up your screen, leave the defaults.

But, if you would like to see what is going on with the lowest possible space taken, click ‘Screen’ in the top column. You should then check off ‘Log successful logins’, and all of the options in the client directry, except ‘Log directory changes’. After doing so, click ‘Ok’ in the bottom left corner.

You will then have to go into ‘Setup -> User Accounts’ (or ctrl & u). From here, you should click on the right most column, and right click. Choose ‘Add’, and choose the username(s) you would like people to have access to.

After giving a name (ex: themoonlanding), you will have to give them a set password in the bottom column (ex: wasfaked). For the ‘Home IP’ directory, (if you registered with a static server, check ‘All IP Homes’. If your IP is static by default, choose your IP from the list. You will then have to right click in the very center column, and choose ‘Add’.

From here, you will have to set the directory you want the people to have access to. After choosing the directory, I suggest you choose the options ‘Read’, ‘List’, and ‘Subdirs’, unless of course you know what you’re doing . After doing so, make an ‘upload’ folder in the directory, and choose to ‘add’ this folder seperately to the center column. Choose ‘write’, ‘append’, ‘make’, ‘list’, and ’subdirs’. This will allow them to upload only to specific folders (your upload folder).

Now click on ‘Miscellaneous’ from the left column. Choose ‘enable account’, your time-out (how long it takes for people to remain idle before you automatically kick them off), the maximum number of users for this name, the maximum number of connections allowed simultaneously for one ip address, show relative path (a must!), and any other things at the bottom you’d like to have. Now click ‘Ok’.
**Requested**
From this main menu, click the little boxing glove icon in the top corner, and right click and unchoose the hit-o-meter for both uploads and downloads (with this you can monitor IP activity). Now click the lightning bolt, and your server is now up and running.

Post your ftp info, like this:

213.10.93.141 (or something else, such as: ‘f*p://example.getmyip.com’)

User: *** (The username of the client)

Pass: *** (The password)

Port: *** (The port number you chose)

So make a FTP and join the FTP section
Listing The Contents Of A Ftp:

Listing the content of a FTP is very simple.
You will need FTP Content Maker, which can be downloaded from here:
ht*p://www.etplanet.com/download/application/FTP%20Content%20Maker%201.02.zip

1. Put in the IP of the server. Do not put “ftp://” or a “/” because it will not work if you do so.
2. Put in the port. If the port is the default number, 21, you do not have to enter it.
3. Put in the username and password in the appropriate fields. If the login is anonymous, you do not have to enter it.
4. If you want to list a specific directory of the FTP, place it in the directory field. Otherwise, do not enter anything in the directory field.
5. Click “Take the List!”
6. After the list has been taken, click the UBB output tab, and copy and paste to wherever you want it.
If FTP Content Maker is not working, it is probably because the server does not utilize Serv-U Software.

If you get this error message:
StatusCode = 550
LastResponse was : ‘Unable to open local file test-ftp’
Error = 550 (Unable to open local file test-ftp)
Error = Unable to open local file test-ftp = 550
Close and restart FTP Content Maker, then try again.

error messages:

110 Restart marker reply. In this case, the text is exact and not left to the particular implementation; it must read: MARK yyyy = mmmm Where yyyy is User-process data stream marker, and mmmm server’s equivalent marker (note the spaces between markers and “=”).
120 Service ready in nnn minutes.
125 Data connection already open; transfer starting.
150 File status okay; about to open data connection.
200 Command okay.
202 Command not implemented, superfluous at this site.
211 System status, or system help reply.
212 Directory status.
213 File status.
214 Help message. On how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user.
215 NAME system type. Where NAME is an official system name from the list in the Assigned Numbers document.
220 Service ready for new user.
221 Service closing control connection. Logged out if appropriate.
225 Data connection open; no transfer in progress.
226 Closing data connection. Requested file action successful (for example, file transfer or file abort).
227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).
230 User logged in, proceed.
250 Requested file action okay, completed.
257 “PATHNAME” created.
331 User name okay, need password.
332 Need account for login.
350 Requested file action pending further information.
421 Too many users logged to the same account
425 Can’t open data connection.
426 Connection closed; transfer aborted.
450 Requested file action not taken. File unavailable (e.g., file busy).
451 Requested action aborted: local error in processing.
452 Requested action not taken. Insufficient storage space in system.
500 Syntax error, command unrecognized. This may include errors such as command line too long.
501 Syntax error in parameters or arguments.
502 Command not implemented.
503 Bad sequence of commands.
504 Command not implemented for that parameter.
530 Not logged in.
532 Need account for storing files.
550 Requested action not taken. File unavailable (e.g., file not found, no access).
551 Requested action aborted: page type unknown.
552 Requested file action aborted. Exceeded storage allocation (for current directory or dataset).
553 Requested action not taken. File name not allowed.
 Active FTP vs. Passive FTP, a Definitive Explanation

Introduction
One of the most commonly seen questions when dealing with firewalls and other Internet connectivity issues is the difference between active and passive FTP and how best to support either or both of them. Hopefully the following text will help to clear up some of the confusion over how to support FTP in a firewalled environment.

This may not be the definitive explanation, as the title claims, however, I’ve heard enough good feedback and seen this document linked in enough places to know that quite a few people have found it to be useful. I am always looking for ways to improve things though, and if you find something that is not quite clear or needs more explanation, please let me know! Recent additions to this document include the examples of both active and passive command line FTP sessions. These session examples should help make things a bit clearer. They also provide a nice picture into what goes on behind the scenes during an FTP session. Now, on to the information…

The Basics
FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a ‘data’ port and a ‘command’ port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port. The confusion begins however, when we find that depending on the mode, the data port is not always on port 20.

Active FTP
In active mode FTP the client connects from a random unprivileged port (N > 1024) to the FTP server’s command port, port 21. Then, the client starts listening to port N+1 and sends the FTP command PORT N+1 to the FTP server. The server will then connect back to the client’s specified data port from its local data port, which is port 20.

From the server-side firewall’s standpoint, to support active mode FTP the following communication channels need to be opened:

FTP server’s port 21 from anywhere (Client initiates connection)
FTP server’s port 21 to ports > 1024 (Server responds to client’s control port)
FTP server’s port 20 to ports > 1024 (Server initiates data connection to client’s data port)
FTP server’s port 20 from ports > 1024 (Client sends ACKs to server’s data port)
In step 1, the client’s command port contacts the server’s command port and sends the command PORT 1027. The server then sends an ACK back to the client’s command port in step 2. In step 3 the server initiates a connection on its local data port to the data port the client specified earlier. Finally, the client sends an ACK back as shown in step 4.

The main problem with active mode FTP actually falls on the client side. The FTP client doesn’t make the actual connection to the data port of the server–it simply tells the server what port it is listening on and the server connects back to the specified port on the client. From the client side firewall this appears to be an outside system initiating a connection to an internal client–something that is usually blocked.

Active FTP Example
Below is an actual example of an active FTP session. The only things that have been changed are the server names, IP addresses, and user names. In this example an FTP session is initiated from testbox1.slacksite.com (192.168.150.80), a linux box running the standard FTP command line client, to testbox2.slacksite.com (192.168.150.90), a linux box running ProFTPd 1.2.2RC2. The debugging (-d) flag is used with the FTP client to show what is going on behind the scenes. Everything in red is the debugging output which shows the actual FTP commands being sent to the server and the responses generated from those commands. Normal server output is shown in black, and user input is in bold.

There are a few interesting things to consider about this dialog. Notice that when the PORT command is issued, it specifies a port on the client (192.168.150.80) system, rather than the server. We will see the opposite behavior when we use passive FTP. While we are on the subject, a quick note about the format of the PORT command. As you can see in the example below it is formatted as a series of six numbers separated by commas. The first four octets are the IP address while the second two octets comprise the port that will be used for the data connection. To find the actual port multiply the fifth octet by 256 and then add the sixth octet to the total. Thus in the example below the port number is ( (14*256) + 178), or 3762. A quick check with netstat should confirm this information.

testbox1: {/home/p-t/slacker/public_html} % ftp -d testbox2
Connected to testbox2.slacksite.com.
220 testbox2.slacksite.com FTP server ready.
Name (testbox2:slacker): slacker
—> USER slacker
331 Password required for slacker.
Password: TmpPass
—> PASS XXXX
230 User slacker logged in.
—> SYST
215 UNIX Type: L8
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
ftp: setsockopt (ignored): Permission denied
—> PORT 192,168,150,80,14,178
200 PORT command successful.
—> LIST
150 Opening ASCII mode data connection for file list.
drwx—— 3 slacker users 104 Jul 27 01:45 public_html
226 Transfer complete.
ftp> quit
—> QUIT
221 Goodbye.
Passive FTP
In order to resolve the issue of the server initiating the connection to the client a different method for FTP connections was developed. This was known as passive mode, or PASV, after the command used by the client to tell the server it is in passive mode.

In passive mode FTP the client initiates both connections to the server, solving the problem of firewalls filtering the incoming data port connection to the client from the server. When opening an FTP connection, the client opens two random unprivileged ports locally (N > 1024 and N+1). The first port contacts the server on port 21, but instead of then issuing a PORT command and allowing the server to connect back to its data port, the client will issue the PASV command. The result of this is that the server then opens a random unprivileged port (P > 1024) and sends the PORT P command back to the client. The client then initiates the connection from port N+1 to port P on the server to transfer data.

From the server-side firewall’s standpoint, to support passive mode FTP the following communication channels need to be opened:

FTP server’s port 21 from anywhere (Client initiates connection)
FTP server’s port 21 to ports > 1024 (Server responds to client’s control port)
FTP server’s ports > 1024 from anywhere (Client initiates data connection to random port specified by server)
FTP server’s ports > 1024 to remote ports > 1024 (Server sends ACKs (and data) to client’s data port)

In step 1, the client contacts the server on the command port and issues the PASV command. The server then replies in step 2 with PORT 2024, telling the client which port it is listening to for the data connection. In step 3 the client then initiates the data connection from its data port to the specified server data port. Finally, the server sends back an ACK in step 4 to the client’s data port.

While passive mode FTP solves many of the problems from the client side, it opens up a whole range of problems on the server side. The biggest issue is the need to allow any remote connection to high numbered ports on the server. Fortunately, many FTP daemons, including the popular WU-FTPD allow the administrator to specify a range of ports which the FTP server will use. See Appendix 1 for more information.

The second issue involves supporting and troubleshooting clients which do (or do not) support passive mode. As an example, the command line FTP utility provided with Solaris does not support passive mode, necessitating a third-party FTP client, such as ncftp.

With the massive popularity of the World Wide Web, many people prefer to use their web browser as an FTP client. Most browsers only support passive mode when accessing ftp:// URLs. This can either be good or bad depending on what the servers and firewalls are configured to support.

Passive FTP Example
Below is an actual example of a passive FTP session. The only things that have been changed are the server names, IP addresses, and user names. In this example an FTP session is initiated from testbox1.slacksite.com (192.168.150.80), a linux box running the standard FTP command line client, to testbox2.slacksite.com (192.168.150.90), a linux box running ProFTPd 1.2.2RC2. The debugging (-d) flag is used with the FTP client to show what is going on behind the scenes. Everything in red is the debugging output which shows the actual FTP commands being sent to the server and the responses generated from those commands. Normal server output is shown in black, and user input is in bold.

Notice the difference in the PORT command in this example as opposed to the active FTP example. Here, we see a port being opened on the server (192.168.150.90) system, rather than the client. See the discussion about the format of the PORT command above, in the Active FTP Example section.

testbox1: {/home/p-t/slacker/public_html} % ftp -d testbox2
Connected to testbox2.slacksite.com.
220 testbox2.slacksite.com FTP server ready.
Name (testbox2:slacker): slacker
—> USER slacker
331 Password required for slacker.
Password: TmpPass
—> PASS XXXX
230 User slacker logged in.
—> SYST
215 UNIX Type: L8
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> passive
Passive mode on.
ftp> ls
ftp: setsockopt (ignored): Permission denied
—> PASV
227 Entering Passive Mode (192,168,150,90,195,149).
—> LIST
150 Opening ASCII mode data connection for file list
drwx—— 3 slacker users 104 Jul 27 01:45 public_html
226 Transfer complete.
ftp> quit
—> QUIT
221 Goodbye.
Summary
The following chart should help admins remember how each FTP mode works:

Active FTP :
command : client >1024 -> server 21
data : client >1024 <- server 20

Passive FTP :
command : client >1024 -> server 21
data : client >1024 -> server >1024

A quick summary of the pros and cons of active vs. passive FTP is also in order:

Active FTP is beneficial to the FTP server admin, but detrimental to the client side admin. The FTP server attempts to make connections to random high ports on the client, which would almost certainly be blocked by a firewall on the client side. Passive FTP is beneficial to the client, but detrimental to the FTP server admin. The client will make both connections to the server, but one of them will be to a random high port, which would almost certainly be blocked by a firewall on the server side.

Luckily, there is somewhat of a compromise. Since admins running FTP servers will need to make their servers accessible to the greatest number of clients, they will almost certainly need to support passive FTP. The exposure of high level ports on the server can be minimized by specifying a limited port range for the FTP server to use. Thus, everything except for this range of ports can be firewalled on the server side. While this doesn’t eliminate all risk to the server, it decreases it tremendously.

It’s truly raining browsers these days. With every browser promising speed and ease of use.

emoko is a web browser with a difference. It is built using technology usually found in video games. When browsing with emoko, pages are rendered inside a 3D world, while the user is represented by a 3D avatar. The user has the ability to interact with other uses as in a RPG.

Are you like me where you just can not download any more programs, or are focusing more on business related downloads and already have so many social media type of applications?

This one is very neat, you do not even need to do a download, and all I had to do was sign in with my facebook account! Would love for them to add Digg and others, and possibly convert it like Mozilla but no download required!

Qwisk | Browse with friends, connect the web.

Why not share this posting?

Mozilla seems to have hit a sweet spot with Personas, the theme engine add-on for Firefox and Thunderbird. While the browser had customization options before and themes support from the early stages, most people weren’t using them, either because they found it complicated or found the selection of themes was rather lacking. In just several months though, 10 million people have customized their browsers with Personas and the number of available designs is staggering.

“Since Personas was launched earlier this year, over 10 million people around the globe have chosen to personalize their Firefox by downloading Personas. Nearly 35,000 designs were contributed from artists at all levels of experience from all parts of the world (over 1,000 designs / week). Nearly 40 affinity brands, including Harry Potter, Bob Marley, Lady Gaga, and Greenpeace have added their content to the gallery. Localization community has diligently translated the add-on into over 25 languages; Personas website will be localized by the end of the year,” Mozilla’s Suneel Gupta and Myk Melez listed some of the team’s achievements.

The Mozilla Labs team just released the latest version of the popular add-on, Personas 1.4 which brought several updates and enhancements mostly related to the user experience. With so many designs it’s getting harder to chose just one but, luckily, now you don’t have to as you can let the add-on periodically change the theme from a pool of favorites you selected. The latest version also enables users to follow an artist they like so that they’re notified whenever a new design is available.

Mozilla Labs is becoming increasingly important to the open-source organization and Personas is certainly one of the most popular projects to come out of it. In just half a year, the team managed not only to create a solid add-on, but also to set up the online gallery to host the designs. In fact, Mozilla is so confident in the project that the functionality is now integrated with the upcoming Firefox 3.6, which will allow users to change the look of their browsers with just one click without having to install the add-on.

[via Softpedia]

One of the most useful and innovative web applications that is beginning to create a buzz is Web Mail. The application (which is used on the Internet) allows it users to access, send, receive and manage their email all through a web browser.

The great thing about web mail is the ability to access your email from almost any computer around the world, as long as you have an Internet connection and web browser.

The difference between traditional electronic mail and web mail is that with traditional mailing the messages are stored on an email client’s one computer while web mail allows access from anywhere via the Internet. Users are attracted to this benefit a lot more than any other.

Web mail is becoming very popular within many technology companies including search engines and portals. A few of the more popular web mail services available include:

• Yahoo! Mail
• Google Gmail
• Hotmail
• AT&T

All of these service providers offer web mail for free. They tend to do this in order to encourage their users to keep coming back to their web site.

Advantages of Web Mail

• Email stored centrally
• Registration is fast and free
• Multiple email addresses can be created for one user
• Large storage capacity

Disadvantages of Web Mail

• Online accessibility
• Advertisements
• Spam and security problems

Numerous web mail users check their email on a daily basis. The more a user visits a specific site the more revenue a company such as Google and Yahoo can make off of advertisements.

About CODANK Charlotte Web Design

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Google Chrome is one of the latest web browsers to hit the market. And, along with it has come a lot of fanfare. Google is also currently working on a Linux based operating system, also called Google Chrome. To date, Google has not released much information about this yet. So – just to be clear – this article only references the Google Chrome Web Browser.

When Google’s Chrome was released in 2008, many of us thought the world really needed one more web browser. (Please read the previous sentence with more than just a touch of sarcasm.) What could Chrome offer that nobody else could?

The answer to that is, simply enough, the power of Google. (Not just the search site, but everything else as well.)

Google Chrome comes with many of the features other popular browsers have, such as tabbed browsing and themes and a download manager, etc. While the current version of Chrome doesn’t support extensions, this feature is in the works and should be available with the next version.

One of the things that really sets Google Chrome apart from other browsers is the ability to add icons on your desktop that point to online applications. For example, if you use Google Docs, you can add icons on your desktop that, when clicked, will open a browser window just for that one online application. This works for other online applications, including games, webmail, etc.

Another difference is the way Chrome handles tabs. With every other browser, if you have a problem with one tab, (especially if the program is forced to shut down) then the rest of the tabs will also feel the pain. No so with Google Chrome. If one tab freezes, the others will, most likely, be fine.

Google also claims its Chrome Web Browser is faster and more stable than the competition. it won’t speed up your internet connection, though.

Jakarta – Opera Mobile 10 Beta kini sudah tersedia untuk perangkat berbasis Windows Mobile. Fungsi-fungsi mirip browser desktop pun dijanjikan akan bisa dirasakan pengguna Windows Mobile.

Seperti dikutip detikINET dari keterangan tertulis yang diterima, Rabu (18/11/2009), Opera Mobile 10 Bet auntuk Windows Mobile telah tersedia untuk diunduh. Versi beta alias ujicoba ini disebut memiliki tampilan mirip Opera 10 versi desktop dan Opera Mini 5 beta.

“Kami berusaha menyeragamkan produk-produk kami agar pengguna dapat merasakan pengalaman yang sama, terlepas dari perangkat atau browser Opera apa yang mereka pakai,” ujar Jon von Tetzchner, CEO Opera Software.

Beberapa hal yang ditekankan oleh Opera mencakup antarmuka baru, Speed Dial, fitur multi tab, manajemen kata sandi, navigasi sentuh hingga menyimpan gambar. Opera Turbo, yang belakangan semakin jadi fitur favorit Opera, juga akan tersedia dalam Opera Mobile 10 Beta.

Opera Mobile 10 beta untuk Windows Mobile tersedia gratis untuk diunduh di http://www.opera.com/mobile/ atau m.opera.com/mobile/ untuk diunduh langsung dari ponsel.

[via detikINET]

Jakarta – Opera mulai memperkenalkan versi beta dari Opera Unite pada Opera 10.10 Beta. Opera Unite diusung sebagai sebuah platform yang memudahkan pengembangan aplikasi pada browser.

Opera Unite memungkinkan sebuah aplikasi dibuat untuk pengguna browser Opera. Seperti dikutip detikINET dari keterangan tertulis yang diterima, Kamis (15/10/2009), Opera Unite Beta mulai tersedia pada Opera 10.10 Beta.

Pengembang software yang ingin memanfaatkan platform Opera Unite disebut cukup menggunakan standar web seperti HTML, CSS dan JavaScript. Aplikasi berbasis Opera Unite pun dikatakan bisa diakses semua browser web pada perangkat apapun.

Beberapa aplikasi Opera Unite pada Opera 10.10:

Photo Sharing: Buat galeri foto secara instan di Web dari PC.
Messenger: Ngobrol langsung bersama teman-teman di My Opera.
File Sharing: Berbagi file dari komputer tanpa harus meng-uploadnya.
Web Server: Mengubah browser Opera menjadi sebuah web server instan yang meng-host situs Web langsung dari komputer.
Media Player: Streaming seluruh katalog musik dari mana saja, langsung, dengan menggunakan browser Web apapun.
Fridge: Menuliskan catatan di ‘pintu lemari pendingin’ virtual.

“Kami mengundang para pengembang di seluruh dunia untuk menggunakan kreativitas dan imajinasi mereka dalam mendorong batasan-batasan yang mungkin ada dengan Opera Unite,” kata Jon von Tetzchner, CEO dari Opera.

Demo :

source detikinet.com & youtube

Mozilla’s Firefox web browser marked a milestone this past week, celebrating its fifth birthday.

No question about it, the open-source browser has been a big success, with growth that has been impressive by any measure. As of the end of July, Firefox had been downloaded more than 1 billion times.

Indeed, a mainstream site like this one here (WordPress) reports that Firefox now represents a larger share of activity than Internet Explorer — 46% versus 39% of traffic.

But now that Firefox has come of age, it’s facing some of the same “grown up” challenges that other browsers face.

In fact, application security vendor Cenzic has just released its security trends report covering the first half of 2009. Guess what? Firefox led the field of web browers in terms of reported total vulnerabilities. Here are the stats from Cenzic:

 Firefox: 44% of reported browser vulnerabilities
 Apple Safari: 35%
 Internet Explorer: 15%
 Opera: 6%

Compared to Cenzic’s report covering the second half of 2008, Firefox’s figure is up from 39%, while IE’s number is down sharply from 43%.

Welcome to reality. As Firefox has grown in importance, it’s gained more exposure to vulnerabilities. A significant portion of those vulnerabilities have come via plug-ins.

Mozilla is trying to take steps to counteract this, including launching a plug-in checker service to ensure that users are running up-to-date versions. It also offers a “bug bounty” to anyone who discovers security holes in Firebox.

And the good news is that even though Firefox had the highest number of vulnerabilities, even Cenzic admits that this doesn’t necesarily mean Firefox users are more vulnerable to security threats. Plus, those vulnerabilities tend to be patched more quickly than those found in other browsers.

So on this fifth anniversary milestone, Firefox can be justly praised as a major success story in the web browser world.

IHS Inc. and Labrador Technologies Inc. (LTI) announced a global strategic agreement to distribute Labrador’s eTriever Web application bundled with IHS Canadian Oil and Gas Critical Information. IHS has the exclusive ability to offer eTriever combined with any oil and gas data on a worldwide basis.    The combination of Labrador’s innovative Web-based data browsing technology with IHS data introduces a new way for customers to work. eTriever will provide customers with easy, quick, mobile access to IHS information from anywhere in the world.

            “This strategic relationship is very complementary to the IHS market-leading position in desktop analysis and data distribution in the Canadian market,” said Rich Herrmann, VP global information access, IHS. “eTriever extends our customers’ options for searching and visualizing our data in a far more flexible manner, including Web browser and mobile application deployment. We are excited to offer this compelling new product to the industry.”

            “From the outset we have built eTriever to access a wide variety of information across multiple industries,” said LTI CEO Ron Sterne. “We believe that the high quality of IHS data is the perfect fit for eTriever distribution, offering new and existing customers the best combination of critical information and agile data browsing.”

www.ihs.com

www.labradortechnologies.com