So my friend had his server up and everything worked. Now i dosen't.
Issue:
When he tries to log into a server the screen goes to dirt background after the logging in has showed.
Then after some seconds it goes white and nothing else happens.
He has:
Newest version of Java. (ps. i know java, it's not the problem.)
Tekkit 2.1.1
He fresh installed everything and shut down everything.
Windows 7, 64-bit.
We also re-installed java, downgraded and everything.
And the server is not the problem either, we have 2 more playing without issues!