The OpsMgr Connector connected to %1, but the connection was closed immediately after authentication occurred. The most likely ...

The OpsMgr Connector connected to %1, but the connection was closed immediately after authentication
occurred.  The most likely cause of this error is that the agent is not authorized to communicate with
the server, or the server has not received configuration.  Check the event log on the server for the
presence of 20000 events, indicating that agents which are not approved are attempting to connect.