SAP J2EE dispatcher running but no server connected

If you call SAP application through browser and get the error "Dispatcher running but no server connected" and jcmon tool shows server nodes in Running status, check the following:

  1. Ensure that the joinPort (5NN20) is not used by any other process in the OS
  2. Ensure that the server node is not set in debug mode. The dispatcher will not route the requests to the server node that is running on debug mode.
  3. Check the parameter elements in the service r3setup. Ensure that the value is not 0. It should be equal to the number of server nodes clustered with the dispatcher
  4. Check if there are repeated full GCs running on the server node


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