Forums mIRC Help invalid user name

i don't know why i receive this error message:

* Connecting to irc.ogamenet.net (6667)
-
-irc.ogamenet.net- *** Looking up your hostname
-
-irc.ogamenet.net- *** Found your hostname, cached
-
-irc.ogamenet.net- *** Checking Ident
-
Ping? Pong!
-
Your username is invalid.
Connect with your real username, in lowercase.
If your mail address were foo@bar.com, your username would be foo.
-
Closing Link: [DarKAWin]L33t_N00b by OGame1.OGameNet.net (USER: Bad username)
-
* Disconnected

after installation of mirc i made my options (network, username ...) and connected to the network ... all fine, i was able to chat, receive data ...
but after rebooting my pc after a few hours i always receive the error posted above. also reinstalling and/or changing rl name, email, username... doesn't help.

I've tried another irc client and received the same error message, but with the notice, that it has something to do with auth.

By the way, don't bother me because of my language, i'm not an english speaking person.

See this thread - it helps to use the Search feature before posting, this issue has been posted many times, hence why I added it to that sticky thread. Make sure you expand to 'All Forums' and 'All Posts' for best results.

Regards,