Event ID 4776 when Mail Source Connection authenticates

We are getting an event log error whenever our Mail Source Connection authenticates. This has been going on for some time, and not a result of a recent upgrade. I am wondering if this is a known issue, and if it can be resolved somehow. Possibly with how we have our Mail Source Connection configured. The Mail Source Connections are working fine and importing emails, but we get an event log error each time the connection authenticates. An annoyance and trying to reduce event log entries.