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Exchange 2003 Cluster Failed Over - But why?

Our Exchange cluster failed over this morning. The failover occured because the HTTP virtual server failed. Only, I cannot determine why. Any ideas why thismight happen?

Subject: Operations Manager Error Alert on domain\server

Severity:  Error
Status:  Netcool
Source:  MSExchangeCluster
Name:  Cluster service failed the Isalive check for the resource.
Description:  Exchange HTTP Virtual Server Instance 100 (server): The IsAlive check for this resource failed.
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Justin Durrant
Asked:
Justin Durrant
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2 Solutions
 
rstovallCommented:
reboot the problem server and fail back over .

voila, the reason you have a cluster .. then continue to t/s if it does not fail over properly
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stronglineCommented:
the event description looks pretty straightforward to me. the cluster didn't detect the http virutal server.
check the system log on the original owner.
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Justin DurrantSr. Engineer - Windows Server/VirtualizationAuthor Commented:
Did that.. all looks normal. Nothing leading up to the vitual server failing that I can see
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Justin DurrantSr. Engineer - Windows Server/VirtualizationAuthor Commented:
I tried to fail back to the original node and the SMTP virtual instance failed. So I am back on my secondary node. Any idea what might be going on?
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Justin DurrantSr. Engineer - Windows Server/VirtualizationAuthor Commented:
Well we rebooted the node and was able to fail back. Not sure what the issue was really.
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