Exchange 2003 sporadic issue with incoming mail not delivering

When mailflow stops flowing to internal users, I notice the following messages in the application event log.

Following client routing node failed to connect to its resvc  C:\Program Files\Exchsrvr\bin\store.exe
Following client routing node failed to connect to its resvc  C:\WINDOWS\system32\wbem\wmiprvse.exe
Following client routing node failed to connect to its resvc  C:\Program Files\Exchsrvr\bin\emsmta.exe
Following client routing node failed to connect to its resvc  C:\WINDOWS\system32\inetsrv\inetinfo.exe

Looked into this issue and found the following:

Ran the command asked and everything came back ok.

The OS is SBS2003 with SP2

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Did you verify the issue from the paragraph about running the 3 command lines and receiving the correct message to determine the issue?

Did you run the Exchange setup program with the /reinstall switch?

Have you got an antivirus scanning the exchange server?

If so you should exclude the store and directories around the smtp, logs etc. There is a great document at which should point you in the correct direction.

Has the machine made a sudden restart without shutting down properly?

Any other clues around the exchange server?

Thanks for posting where you are up to.

Pearltech2013Author Commented:
The client has since purchased a new server and new version of Exchange.

Rebooting the spam filter fixed the sporadic issue.

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Pearltech2013Author Commented:
Rather than troubleshooting the event logs further, the client went ahead and purchased a new server and newer version of exchange.
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