We recently started experiencing a few site crashes but there were no obvious errors, but after some investigating one of my colleagues (nicknamed the Wolf) stumbled across this error message:
CODE:
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DCOM got error "Overlapped I/O operation is in progress. " and was unable to logon .\IWAM_BOB in order to run the server:
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{3D14228D-FBE1-11D0-995D-00C04FD919C1}
He dug a little further and found the solution to the problem (look for the post by yakhunter). For posterity here is the resolution.