We have got a active passive cluster. and I am getting service account trying to access the master database on the active node using the database mail. That's what i found through the profiler trace. I am getting error logged into the active node sql server logs saying
Login failed for user . Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: ]
This error logs very often, we can say every 1 -2 minutes.
Can anyone please throw some light that what is trying to access this? and how can i find more info?