I had this problem a thousand times, it took me many hours to solve it in every single case, but there´s a really good guide available at the mIRC website how to manage this fast and easy :
And for all of you who aren´t lucky with this guide. If you have a linux box somewhere in the net to connect to, use xming and putty and just tunnel your way through the wall. Good luck !!!
If you use Windows 7 or above the proxycfg command won´t work. Instead you can you netsh with the following syntax:
C:\netsh winhttp show proxy
Howto find out the proxy configuration, if all IE security options are invisible and disabled ?
Good question and the answer took me 2 hours of search on the net. The answer is so damn simple, that I felt a bit annoyed after I found it:
Microsoft ® WinHTTP Default Proxy Configuration Tool Copyright © Microsoft Corporation. All rights reserved.
Current WinHTTP proxy settings under:
HKEY_LOCAL_MACHINE\ SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\ WinHttpSettings:
Proxy Server(s) : http=???.???.??.? Bypass List : ???.???.??.?