Microsoft Exchange 2019 Event ID 4999 and 1003

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Lately we have been seeing a lot of these errors in event viewer

Everything is working fine , we can connect to ECP/OWA and the OAUTH certificate is valid

we are just wondering why we get so many of them... ( Server 2019 STD with Exchange 2019 STD CU13 onpremise )

it usually start with 4999 then it's followed by about 20/30times the same 1003 error

Thank you

Exchange Server
Exchange Server
A family of Microsoft client/server messaging and collaboration software.
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  1. Wandi Ding -MSFT 2,870 Reputation points Microsoft Vendor


    Based on the situation you described, I would like to confirm with you, have you performed any special operations on certificate or on your server before and have you installed any updates recently? Besides, could you please check and post the details of the errors in event viewer?

    In addition, it is recommended that you run the health checker PowerShell script to see if it can provide more information.

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