After capturing the network traffic it seems the problem is here. Kopete sends several Jabber messages in a long tcp packet that ends with:

<iq type="error" to="user@server/OsMac" id="purple1b433a37" >
<query xmlns="jabber:iq:last"/>
<error type="cancel" >
<feature-not-implemented xmlns="u

Then a single TCP packet with:

trn:ietf:para

And server responds:

<stream:error xmlns:stream='http://etherx.jabber.org/streams'><xml-not-well-formed xmlns='urn:ietf:params:xml:ns:xmpp-streams'/><text xmlns='urn:ietf:params:xml:ns:xmpp-streams'>mismatched tag</text></stream:error>

I can confirm this problem - kopete connects to server and then disconnect with this message...

Same here. Server - Jabber.ru, for livejournal.com kopete works fine. I can even connect to server using invisible mode, than go to visible, but this is a workaround only.

Any tcpdump needed?

I suspect that I ran into this bug while trying to connect to our internal ejabberd server (version 2.0.3) using Kopete 4.2.4 from PPA packages for Kubuntu 9.04.

Connecting and chatting works fine with Pidgin 2.5.5. However, this is what the ejabberd logs show when I try to connect from Kopete using the exact same settings ('jabber.example.net' is a made-up pseudonym for our Jabber server located at 10.0.0.10):


=INFO REPORT==== 2009-07-31 15:43:22 ===
I(<0.264.0>:ejabberd_listener:116) : (#Port<0.3454>) Accepted connection {{10,0,0,200},58031} -> {{10,0,0,10},5222}

=INFO REPORT==== 2009-07-31 15:43:22 ===
D(<0.1732.0>:ejabberd_receiver:306) : Received XML on stream = [128,116,1,3,1,
                                                                0,75,0,0,0,32,
                                                                0,0,57,0,0,56,
                                                                0,0,53,0,0,22,
                                                                0,0,19,0,0,10,
                                                                7,0,192,0,0,
                                                                51,0,0,50,0,0,
                                                                47,3,0,128,0,
                                                                0,5,0,0,4,1,0,
                                                                128,0,0,21,0,
                                                                0,18,0,0,9,6,
                                                                0,64,0,0,20,0,
                                                                0,17,0,0,8,0,
                                                                0,6,4,0,128,0,
                                                                0,3,2,0,128,
                                                                77,60,103,160,
                                                                115,172,19,
                                                                212,133,38,31,
                                                                50,174,221,52,
                                                                177,83,247,
                                                                242,72,139,44,
                                                                2,157,94,149,
                                                                99,219,187,
                                                                129,89,43]

=INFO REPORT==== 2009-07-31 15:43:22 ===
D(<0.1733.0>:ejabberd_c2s:1346) : Send XML on stream = "<?xml version='1.0'?><stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='none' from='jabber.example.net' version='1.0'><stream:error><xml-not-well-formed xmlns='urn:ietf:params:xml:ns:xmpp-streams'/></stream:error></stream:stream>"


The server is configured to force STARTTLS.

Is this still happening?