I'm seeing a couple (about 7 or 😎 of MSExchange Common errors (Event ID 4999) on a daily basis since applying January SU on Ex2016, WinSrv 2016 DC:
Watson report about to be sent for process id: 9836, with parameters: E12IIS, c-RTL-AMD64, 15.01.2507.017, w3wp#MSExchangeServicesAppPool, M.Exchange.Services, M.E.S.C.T.ServiceResult`1.ProcessServiceResults, System.ArgumentNullException, feb4-dumptidset, 15.01.2507.017.
ErrorReportingEnabled: False
It does not impact the functionality at all as everything works fine as far as I can see but I'm wondering whats wrong with it. It started shortly after SU installation.
I have not enabled Certificate Signing yet.
Any ideas?