[Serusers] Error with jabber module

[Mark]

Hello:

I am trying the jabber module.
IM seems to work, but after a while SIP client (Windows Messenger) receives 
an "Error: Connection to Jabber server lost. You have to login to Jabber 
server again".

I've read that this is caused by a disconnection between Jabber GW and Jabber 
Server. Jabber server seems to work after that error.

What can I do to discover where is the problem?.

Thank you,
Mark