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Exchange Team Blog
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Released: July 2021 Exchange Server Security Updates

The_Exchange_Team's avatar
The_Exchange_Team
Platinum Contributor
Jul 13, 2021
Microsoft has released security updates for vulnerabilities found in: Exchange Server 2013 Exchange Server 2016 Exchange Server 2019 All versions (Cumulative Update levels) are impacted. ...
Updated Aug 05, 2021
Version 15.0
announcements
Exchange 2013
exchange 2016
exchange 2019
security
setup
maratn's avatar
maratn
Copper Contributor
Jul 15, 2021

Hello all,

 

I installed Exchange 2013 CU23 on our standalone server and got the same issue:

 

Exception type: ExAssertException
Exception message: ASSERT: HMACProvider.GetCertificates:protectionCertificates.Length<1

The Exchange Auth certificate wasn't expired though. Anyway I tried generating a new certificate and publish it. It didn't resolve the issues. Even after 2 hours of waiting.

After all (before trying the last resort option to uninstall CU23) I tried using the old valid certificate and published it using the same procedure as described https://docs.microsoft.com/en-us/exchange/troubleshoot/administration/cannot-access-owa-or-ecp-if-oauth-expired.

OWA and ECP returned back to life.

 

With the best regards,

Marat