This Knowledgebase article provides information about the Error Message: 'Unclean exit: This server was once the active server. To maintain system stability it should be rebooted'.
The server process terminated unexpectedly. The Neverfail Heartbeat Management Client shows a "?" over one of the servers on the 'System' panel. The channel is not connected.
Follow dialog instructions and reboot the server. Can the Management Client connect to the other server? Is it active? If it is active, then check the configuration of the failed server when the reboot has completed. Restart the failed server.
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KBID-47