I've downgraded the package libqca2-plugin-ossl with: $ apt-cache policy libqca2-plugin-ossl Version table: *** 2.0.0~beta3-1 0 0.1~20070904-4 0 $ sudo aptitude install libqca2-plugin-ossl=0.1~20070904-4 After a restart of Kopete, I can connect again. The bug may be in libqca2-plugin-ossl or maybe the API has changed and Kopete cannot use the new API, or I don't know what.