When NNTASK is unexpectedly killed or terminated, the command "load nntask" at the domino console triggers this error message.
Unknown OS error
SMSDOM: Service shutdown completed
Process C:\Program Files\IBM\Lotus\Domino\nntask.EXE (932/0x3A4) has terminated abnormally
If SMSDOM scan was running when NNTASK is terminated, you may also see the SMSDOM Scan running via "sh ta" command.
SMSDOM Scan Scanning [number]
When NNTASK is terminated or killed unexpectedly, it appears that SMSDOM Mail Scanner and WriteScanner threads are not cleaned up properly.
Due to hung state of the NNtask's threads, a restart of the Domino server and the Operating System would be necessary.
Note: In some instances, the mail.box may need to be replaced due to corruption.