Contact the company guy in charge of the system and have them check the firewall. Also check your computers as well.

Open your firewall program. First check the settings. Make sure that the program is set to tell you if a new program wants access to the web. Then go to the list of programs the firewall has. Make sure that all the programs you want to access the web are set to ALLOW. If it is set to AUTO, the firewall may not allow access.

thanks alot for your quick reply fredmcd

i have searched alot on the internet and got the solution , it was a thread known as "l.yimg.com". every time i open a website ,it stucks in "transferring data from l.yimg.com" , so what i did is;

1) End the process "random.exe" from task manager

2) Delete all the history and cookies of the infected browser.

3) Opened Registry Editor and delete these malicious entries:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ L.yimg.com

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\L.yimg.com \DisplayName L.yimg.com

HKEY_USER\.default\environment\temp

HKEY_USER\s-1-5-18\environment\temp

HKEY_USER\ s-1-5-19\environment\temp and so on

4) Search those malicious files on your hard disk and completely delete all of its components.

%AllUsersProfile%\{random}

%AllUsersProfile%\Application Data\.dll

it really worked for me , if anyone have the same problem then try it , hopefully it will work for you too.

[[Knowledge Base Article|http://rescueyourcomputer.blogspot.com/2013/11/remove-lyimgcomeffectively-get-rid-of.html]]

http://blog.mitechmate.com/remove-l-yimg-com-popup/]

http://blog.teesupport.com/how-to-stop-l-yimg-com-pop-up-guide-to-remove-l-yimg-com-redirect-virus/

If you solved the problem, Great ! ! There are malware scanners that can help you. Run several of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

==========================

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

I'm not sure if theses keys have to do with your issue.

HKEY_USER\.default\environment\temp
HKEY_USER\s-1-5-18\environment\temp
HKEY_USER\ s-1-5-19\environment\temp

What was their content?

You may have to check the environment variables in the "Control Panel > System" to see if you still have the %TMP% and %TEMP% variables that define the location to be used as temp folder.