On reconnect the groupchat is available with jenkins inside but the presence is not send to the private user list.
I can't see jenkins in my userlist after a reconnect. Restart jenkins will fix this issue but this should work on the fly.

Log:

Nov 28, 2011 9:41:52 AM hudson.security.csrf.CrumbFilter doFilter
WARNING: No valid crumb was included in request for /administrativeMonitor/hudson.diagnosis.ReverseProxySetupMonitor/test. Returning 403.

Nov 28, 2011 9:41:52 AM hudson.security.csrf.CrumbFilter doFilter
WARNING: Found invalid crumb <hidden>. Will check remaining parameters for a valid one...

Nov 28, 2011 9:41:31 AM hudson.plugins.jabber.im.transport.JabberIMConnection connect
INFO: Joined groupchat <hidden>.jabber.ccc.de

Nov 28, 2011 9:41:31 AM hudson.plugins.jabber.im.transport.JabberIMConnection connect
INFO: Connected to XMPP on jabber.ccc.de:5222/jabber.ccc.de using TLS

Nov 28, 2011 9:41:30 AM hudson.plugins.jabber.im.transport.JabberIMConnection setupSubscriptionMode
INFO: Subscription requests must be handled manually

Nov 28, 2011 9:41:29 AM hudson.plugins.jabber.im.transport.JabberIMConnection createConnection
INFO: Trying to connect to XMPP on jabber.ccc.de:5222/jabber.ccc.de with SASL

Nov 28, 2011 9:41:26 AM hudson.plugins.im.IMConnectionProvider$ConnectorRunnable run
INFO: Trying to reconnect