A EPiServer 6 R2-solution has been found to have a problem with it's Changelog Auto Truncate Job. It runs every night, and claims to finish OK, but the message is:

"Exception: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding."

There seems to be a lot of old entires in the solution, that ought to have been removed by this job.

I have tried to set the log level to All, but still there is no trace of this error message or anything relating to this job failing in the log. 

What might be timing out within this job, and why is the job claiming to have finished OK and not left any error messages in the log?