Socket override by another connection

With
http://lab.vectoris.fr/projects/vectoris/browser/JabberConf/trunk
I get in jabber/error.log:

20090316T12:08:11: [warn] (muclinker): Socket override by another 
connection from 41.204.105.250
20090316T12:08:11: [warn] (muclinker): Socket override by another 
connection from 41.204.105.250
20090316T12:08:11: [warn] (muclinker): Socket override by another 
connection from 192.168.0.7
20090316T12:08:13: [warn] (muclinker): Socket override by another 
connection from 41.204.105.250
20090316T12:08:13: [warn] (muclinker): Socket override by another 
connection from 41.204.105.250
20090316T12:08:13: [warn] (muclinker): Socket override by another 
connection from 41.204.105.250

41.204.105.250 is my public IP address and 192.168.0.7 the one the 
jabber and jabber-muc packets are NATed to.

what could be the problem?

Then I cannot register nor connect to the jabber server.

-- 
                              Chef de projet chez Vectoris
                                  Phone: +261 33 11 207 36
System: xUbuntu 8.10 with almost all from package install
    http://www.google.com/search?q=mihamina+rakotomandimby
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