Information on an alarm : The remote server machine does not exist or is unavailable

Information on an alarm : The remote server machine does not exist or is unavailable

Hello,
 
We started getting the alarm "The remote server machine does not exist or is unavailable " on some servers when we reboot them.  What is this alarm?  I can't figure out which monitor this is...
 
Plus, this alarm clears between 4 hours to 2 days after it got triggered even when the server is up and running.
 
I tought for a minute that it was the availability monitor alarm but after testing the alarm triggered by the availability monitor is still "Device Down: No response from device for last 5 polls "
 
Can someone shed a light on this?
 
Thanks

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