Exchange Server error in '/owa' application

ASSERT: HMACProvider.GetCertificates:protectionCertificates.Length<1 Description: An unhandled exception occurred during the execution of the current web request. Please review the stack tr...

Exchange Server

Asterofus
Jul 14, 2021
Ok i found solution. Use this to create new certificate https://docs.microsoft.com/en-us/exchange/troubleshoot/administration/cannot-access-owa-or-ecp-if-oauth-expired

And after creating the certificate you must wait like a hour or more for changes work. Restart dont change the wait time 🙂

Matt-Freeman

Copper Contributor

We are having the same issue. However my current OAuth cert doesn't expire until 4/22. Any reason to replace it anyway? Also, I applied KB5004779 yesterday.

db123123

Copper Contributor

Jul 14, 2021

I encountered the same issue, uninstalled the update and it worked. I'm going to wait to see is there is a new update that doesn't break anything.

mavaca
Copper Contributor
Jul 29, 2021
Hi db123123. Is the KB5004779 ?

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Exchange Server error in '/owa' application

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