Server or Broker Failure

If the Web server fails and is restarted, all connections are restored and there is no effect on clients. However, if the broker fails and is restarted, an exception is thrown and clients must re-establish their connections.

If both the Web server and the broker fail, and the broker is not restarted, the Web server restores client connections and continues waiting for a broker connection without notifying clients. To avoid this situation, always make sure the broker is restarted.