Client does not find responsible jabber servers (not parsing SRV DNS records)
Jabber servers can be defined using SRV records. (http://prosody.im/doc/dns, http://wiki.xmpp.org/web/SRV_Records)
e.g. the nic max@example.com can have xmpp servers that do not listen on the example.com servers but on xmpp.example.com. These would be defined in a SRV record, see links.
It seems the client does not check for these records, as it tries to connect to example.com directly.
current workaround is to define xmpp.example.com as server manually in the advanced options.
Trac:
Username: flowolf