With no prior events in the event log and no recent changes to the server we have suddenly encountered an unreliable SMTP server. Event ID: 7034, 7031 Service Terminated Unexpectedly.
We have successfully restarted the services and the system will run well for some 5 or 6 hours then will quit again. Once it quits, it quits repeatedly for some length of time and then begins to work again. We have isolated the problem to the Exchange Server 2003 (running on Windows 2003 Server).
We had suspected some kind of DOS attack. The server is behind a PIX501 and Nessus scans are negative for vulnerabilities. sc query yields: 1067 (0x42b)
Any assistance gladly accepted. thx