I am doing everything whatever you have mentioned in ur response.Going further I have switched on the "TRACE" level debugging.I can see the following message in the log file while JBoss is establishing the connection, 2007-02-27 11:58:51,876 TRACE [org.jboss.resource.connectionmanager.CachedConnectionManager] registering connection from org.jboss.resource.connectionmanager.NoTxConnectionManager@1670cc6, connection : de.chs.siebel.jca.SiebelConnection@dc420b, key: null If I check the source code of "CachedConnectionManager" I can see this logging in "registerConnection" method of the same class.In the same method I can see an if loop as, if (key == null) return; //not participating properly in this management scheme. Now If you look at the TRACE log we can surely say that a null key is passed to the "registerConnection" method. Hence I am totally confused to see what JBoss is doing and what is expected output. Do I need to configure somewhere that my RA must use a NoTxConnectionManager ? Also when the connection is closed I can see the following log message generated, 2007-02-27 11:58:51,891 TRACE [org.jboss.resource.connectionmanager.CachedConnectionManager] unregistering connection from org.jboss.resource.connectionmanager.NoTxConnectionManager@1670cc6, object: null, key: null | 2007-02-27 11:58:51,891 INFO [org.jboss.resource.connectionmanager.NoTxConnectionManager] Unregistered handle that was not registered! null for managedConnection: de.chs.siebel.jca.SiebelManagedConnection@65ab77 Can you guide me to solve this problem ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4022881#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...