Has this been resolved? I am facing the same issue. I have 2 JBOSS servers 
setup in a cluster for JMS messaging. The Servers are given the IDs 13225 and 
13226 in the deploy\jboss-messaging.sar\messaging-service.xml. When I restart 
one of the servers, I get the same error message:

Reason: java.lang.IllegalArgumentException: Cannot start post office since 
there is already a post
  |  office in the cluster with the same node id (13225). Are you sure you have 
given each node a unique
  |  node id during installation?
  | 

This happens only intermittently and not on every server restart. 
Also, another interesting thing is that the node ID in the message above is the 
ID of the server that is restarted. i.e. When I restart the server with ID 
13225 the above message is displayed. So its as if the server is refering to 
its own ID.

I do not have any other clusters setup on the same network.

Any hints, suggestions welcome!

Thanks.

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