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Error " mail server is not availbale"

We keep seeing this warning message on Unity event view:

AvExchangemonitor_MC and inside this is Server DC1Exchange back on line.Resyncing mailbox. This appears every 10 or 20 minutes.

Also this event view is very often. Cisco TSP port7 disconnect from CCM. We have 4 ports in the unity. Basically all these 4 ports keep rehome from 2 CCMs.

Ocassionly users who access mailbox will hear mail server is not available.

Based on the above information, can you guys briefly determine is this the problem of Exchange server or Unity server?


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Re: Error " mail server is not availbale"

Unity pings the services on all Exchange servers that house one or more subscribers' mailstores for us - if the response time is too slow (or not existant) it will mark the server as being off line since if we try to log into that mailstore MAPI has _really_ long timeouts that can cause us to burn a port. While we think the server is off line we wont allow subscribers homed on that server to check their messages. We will continue trying to ping the server and if we get an appropriate response back indicating the message services on that box are up and flying we'll mark the server as being on line again (that's the event log message you're seeing).

It sounds like you may be having some connectivity issues with one or more Exchange servers in your network or some bad latency issues or the like.

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