If your pidgin IM fails to connect to ICQ, you may need to update it. The ubuntu default sources are usually outdated.
Just follow the instructions 1-4 and 1-3 on the page linked below.
Making SSL connection work
If you can not connect using SSL, open up the account settings and enable "clientLogin". Also, your Server should be set to slogin.icq.com
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Posted by Tobias Kraze to makandra dev (2010-11-18 09:06)