After you have left Mail Monitor running for a number of days, commands to the client can fail (without the client itself shutting down). The Motif display warns you of this condition by showing a system icon in white (if the Status Tool, when activated on that icon, reports a connection failure.
If this happens you should make these checks (on the server system) before restarting the server:
If the processes are not running, consult the DIGITAL Enterprise Mail Monitor Server Guide.) for details of how to restart Mail Monitor. If they are running you can either shut down and restart the server, or shutdown the relevant process:
The server restarts automatically.