We are experiencing a very similar problem, and I was hoping on clarification on whether or not there is a bug here, and if it has been fixed. Or if there is a way to debug this issue. The server is 4.0.3SP1 jboss server on a linux box. The client is 4.0.2. Our JMS client has a topic connection that has a listener. The listener sets a flag, and another thread will [very quickly] clean up and then reconnect when it sees the flag set. The problems began when there was a network outage. Since then, we've been in a cycling loop of reconnects. The client gets a "no pong received". The onException is invoked. The thread cleans up and reconnects. Messages are transferred from the client to the server, and from the server to the client. A minute later, we get a "no pong received" exception - repeat. 2008-08-06 09:46:01,416 WARN [TopicConnectionManager] the connection to the management server was broken: org.jboss.mq.SpyJMSException: No pong received; - nested throwable: (java.io.IOException: ping timeout.) | 2008-08-06 09:46:02,112 WARN [TopicConnectionManager] successfully established a connection to the management server | 2008-08-06 09:47:01,416 WARN [TopicConnectionManager] the connection to the management server was broken: org.jboss.mq.SpyJMSException: No pong received; - nested throwable: (java.io.IOException: ping timeout.) | 2008-08-06 09:47:02,459 WARN [TopicConnectionManager] successfully established a connection to the management server | 2008-08-06 09:48:01,420 WARN [TopicConnectionManager] the connection to the management server was broken: org.jboss.mq.SpyJMSException: No pong received; - nested throwable: (java.io.IOException: ping timeout.) | 2008-08-06 09:48:01,811 WARN [TopicConnectionManager] successfully established a connection to the management server | 2008-08-06 09:49:01,424 WARN [TopicConnectionManager] the connection to the management server was broken: org.jboss.mq.SpyJMSException: No pong received; - nested throwable: (java.io.IOException: ping timeout.) | 2008-08-06 09:49:02,152 WARN [TopicConnectionManager] successfully established a connection to the management server | 2008-08-06 09:50:01,424 WARN [TopicConnectionManager] the connection to the management server was broken: org.jboss.mq.SpyJMSException: No pong received; - nested throwable: (java.io.IOException: ping timeout.) | 2008-08-06 09:50:01,500 WARN [TopicConnectionManager] successfully established a connection to the management server | 2008-08-06 09:51:01,428 WARN [TopicConnectionManager] the connection to the management server was broken: org.jboss.mq.SpyJMSException: No pong received; - nested throwable: (java.io.IOException: ping timeout.) Here's what the debug log shows. 2008-08-06 10:20:01,476 DEBUG [TopicConnectionManager] exception reported on topic connection | org.jboss.mq.SpyJMSException: No pong received; - nested throwable: (java.io.IOException: ping timeout.) | at org.jboss.mq.Connection$PingTask.run(Connection.java:1323) | at EDU.oswego.cs.dl.util.concurrent.ClockDaemon$RunLoop.run(ClockDaemon.java:364) | at java.lang.Thread.run(Thread.java:619) | Caused by: java.io.IOException: ping timeout. | ... 3 more We have seen the same exact problem on many clients on different machines, connected to the same server. The log file shows a "no pong received" exception delivered every 60 seconds, apparently forever. There are no huge messages, or large numbers of exceptions. This is verified with tcpdump. Since JMS seems like its otherwise working - server sees what the client published, client sees what the server published - this looks like some sort of JBoss issue. Can anyone help? I'm not sure what else it would be helpful to know. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4169143#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...