We upgraded from 1.180 to 1.211. Jabber plugin 0.4 don't work. Tried to re-upload it, same error.
Looks like can't connect to server. It was working hour ago. Server configuration/availability didn't
change.
Anyway why plugin loading should fail because of server?

hudson.util.IOException2: Failed to initialize
at hudson.PluginWrapper.load(PluginWrapper.java:290)
at hudson.PluginManager.(PluginManager.java:90)
at hudson.model.Hudson.(Hudson.java:333)
at hudson.WebAppMain$2.run(WebAppMain.java:155)
Caused by: java.lang.ExceptionInInitializerError
at hudson.plugins.jabber.im.transport.JabberPluginImpl.start(JabberPluginImpl.java:23)
at hudson.PluginWrapper.load(PluginWrapper.java:287)
... 3 more
Caused by: java.lang.IllegalStateException: Not connected to server.
at org.jivesoftware.smack.XMPPConnection.sendPacket(XMPPConnection.java:699)
at org.jivesoftware.smack.NonSASLAuthentication.authenticate(NonSASLAuthentication.java:54)
at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java:223)
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:426)
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:389)
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:370)
at
hudson.plugins.jabber.im.transport.JabberIMConnection.createConnection(JabberIMConnection.java:14
5)
at hudson.plugins.jabber.im.transport.JabberIMConnection.(JabberIMConnection.java:76)
at
hudson.plugins.jabber.im.transport.JabberIMConnectionProvider.createConnection(JabberIMConnection
Provider.java:37)
at
hudson.plugins.jabber.im.transport.JabberPublisherDescriptor.(JabberPublisherDescriptor.java:62)
at hudson.plugins.jabber.im.transport.JabberPublisher.(JabberPublisher.java:64)
... 5 more

While you're at it, can we finally proper status indication in Jabber,
e.g. when building to appear "busy" Jabber. (Now it always offline).
And simple interaction like messaging to Hudson to return job satus
and progress. I posted feature request for that.