Version: (using KDE 4.3.1)
Installed from: Debian testing/unstable Packages
It seems that the http proxy settings are not used. According to netstat, the kopete process tries to connect (SYN_SENT) directly to some host on the https (443) port.
Because of this, I can not log in at all (port 443 is filtered).
Konqueror does use the proxy settings and works well with https, so the settings are OK.
This bug has been reported at 186872 please vote, the more votes you have more chances that it fixed. Thanks
*** This bug has been marked as a duplicate of bug 186872 ***