it will not let me connect only to the quakenet server. no idea why. here is the error message:

* Connecting to 213.131.156.50 (6668)
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-213.131.156.50- *** Looking up your hostname
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-213.131.156.50- *** Found your hostname, cached
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-213.131.156.50- *** Checking Ident
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-213.131.156.50- *** No ident response
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Your username is invalid.
Connect with your real username, in lowercase.
If your mail address were foo@bar.com, your username would be foo.
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Closing Link: Gregair13 by wineasy1.se.quakenet.org (USER: Bad username)
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* Disconnected



I tried changing the username and all that stuff, but it did not work. what to do?