Ok here is the Tutorial/fix: Big thanks goes to "special" on iirc chat

** This Tutorial is only for users what use a own server with openfire **

01) create a xmpp account (username: name@debian, pw: your pw)
by me is it @debian, because a named it so in openfire
02) activated developers mode on jolla (if you dont do this before)
03) typ in Terminal this:
=> you will get this information: gabble/jabber/jabber_xx
=> this number on the end is importend for the next steps

04) type now this with the correct number! (xx):
05) now we change the server adress from default (dont forget the jabber number) - type this all in one line!
06)the follow step is ONLY if you use a different port (jabber default port is 5222, but my port is different)
xx = jabber number
yyyyy= your new port

after than there will restart the service and you will find your contacts in contacts in the earth symbol. pull up from buttom and than pulldown, and you will see your status in the top

sorry for my bad english , hope you will understand me

UPDATE: Its now possible to usw a own certificate.

first create a folder in telepathy:
than copy your cert (jabber-ca_or_cert.crt) in the Download folder and type this in the terminal, too
Restart Phone and have fun if is it not working, than you have re add your account

Thanks to Alexander Couzens to find a solution and Nokiuss60 tell us

German Tutorial: http://sailfishmods.de/mods/modssw/x...mpp-server.htm