[jboss-user] [Clustering/JBoss] - How to debug multicast hang?

[peso60]

I am running oracle application server 10.1.3.0 which, apparently uses jgoups. All of a sudden on my Red Hat 3 (Red Hat Enterprise Linux AS release 3 (Taroon Update 6)) machine the process starts, but doesn't respond to any requests.

There were no changes to configuration or code, or machine, tried reboot and make sure no other java processes are running.

The last out put before it stops responding is this:

2006-10-30 11:14:22.726 WARNING option GET_STATE_EVENTS has been deprecated (it is always true now); this option is ignored
Oct 30, 2006 11:14:22 AM org.jgroups.protocols.pbcast.NAKACK handleConfigEvent
INFO: max_xmit_size=64000
Oct 30, 2006 11:14:22 AM org.jgroups.protocols.UDP createSockets
INFO: sockets will use interface 140.87.10.48
Oct 30, 2006 11:14:22 AM org.jgroups.protocols.UDP createSockets
INFO: socket information:
local_addr=140.87.10.48:1045, mcast_addr=234.5.5.5:24667, bind_addr=/140.87.10.48, ttl=32
sock: bound to 140.87.10.48:1045, receive buffer size=524288, send buffer size=524288
mcast_recv_sock: bound to 140.87.10.48:24667, send buffer size=524288, receive buffer size=524288
mcast_send_sock: bound to 140.87.10.48:1046, send buffer size=524288, receive buffer size=524288


'ps' shows that the java process that was supposed to start is in fact running, and the main HTTP listening port (8888) is shown as LISTEN by netstat and lsof; lsof output:

 lsof|grep 8888
java      12642 opeschan   35u  IPv4    9721891                 TCP *:8888 (LISTEN)

But the port is not responding, simple 'kill' does not kill the java process, but 'kill -5/-9' kills it.

Where do I even start looking for a reason? 
I tried reboot, it didn't help.

THAAANKS!

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