When I'm at a lan-party or just anywere els but at home with my computer, and i try to connect to IRC, it says:
Your username is invalid.
Connect with your real username, in lowercase.
If your mail address were firstname.lastname@example.org
, your username would be foo.
Closing Link: xxxxx by splatterworld3.de.quakenet.org (USER: Bad username)
but when i'm home, there is no ploblem with connecting...