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two days a go I renewed the certificates (Microsoft Exchange and Microsoft Exchange Server Auth Certificate) on Exchagne Server 2016. Then something strange happened :( The clients could no longer send and receive emails, and the Exchange Admin Center was no longer accessible.
In IIS Manager I selected the certificates again. After that, the clients could work again. but the problem is, ECP is still unreachable.
Many thanks for any help
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Hi @Bariq Ismael ,
I'm here to confirm with you if your issue has been resolved.
If the problem is successfully solved, you can share your solution or accept the helpful reply as answer, this will make answer searching in the forum easier and be beneficial to other community members as well.
Did you follow this when you renewed the Microsoft Exchange Certificate?
[https://ehloergosum.com/2020/01/25/renewing-that-pesky-microsoft-exchange-certificate/https://ehloergosum.com/2020/01/25/renewing-that-pesky-microsoft-exchange-certificate/
Hi @Bariq Ismael ,
Please refer to this link to check if the OAUTH certificate is configured correctly：
Can't access OWA/EAC with expired OAuth certificate - Exchange | Microsoft Learn
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