Alex,
This sounds like the XMPP server needs fixing, not gajim. You can test that
by loading a different XMPP/jabber client and seeing if you get the same
response. "remote-server-not-found" means the XMPP server can't find or
connect to the JID (jabber ID) you're requesting.
http://xmpp.org/rfcs/
After a hard drive crash I had to reinstall the XMPP server and restore
its DB from backup.
Everything in the server seems to have been restored back to its state
before the crash, at least the users are there and each of them can
still connect their Gajim after accepting the new SSL cert.
But t