gnodet commented on issue #461:

   If you have a heartbeat configured, you may want to check its configuration. 
 The properties defined in 
 control the heartbeat: `session-connection-heartbeat-type` seems to be set to 
40s in your case.  You may also have a connect timeout set to 20s according to 
the client error message.  You also have a custom heartbeat sender configured 
(sending ``). 
   I would check this custom heartbeat, as it wonder if it does wait for a 
response, which should not be the case for a heartbeat (they usually just send 
a message without waiting for a response, just to keep things alive).

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