CTGKM3428E The server is unreachable. Check the network connectivity and ensure that the WebSphere® Application Server is running.

  Explanation
   As a prerequisite check, the Add master server operation verifies whether the server is reachable.

  System action
   The Add master operation fails.

  Administrator response
    Check the firewall rules, network connectivity, and ensure that the WebSphere Application Server is running.   