can't access Exchange 2013 Admin ECP and OWA Page after applied Security Update For Exchange Server 2013 CU23 (KB5004778)

Maqbool Hussain 1 Reputation point
2021-10-05T01:32:49.813+00:00

Hi ,

can't access Exchange 2013 Admin ECP and OWA Page after applied Security Update For Exchange Server 2013 CU23 (KB5004778).

I am getting the following message

something went wrong
Sorry, we can't get that information right now. Please try again later. If the problem continues, contact your helpdesk.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor
    2021-10-06T01:23:57.547+00:00

    Hi @Maqbool Hussain

    Is the detailed error message "ASSERT: HMACProvider.GetCertificates:protectionCertificates.Length<1"?
    If it is the case, the cause of the issue may be the Microsoft Exchange Server Auth Certificate is expired or missing.
    You may use this command to check: 

    Get-ExchangeCertificate (Get-AuthConfig).CurrentCertificateThumbprint

    If there is no result returned or the certificate has expired, please follow the steps in this link to create a new OAuth certificate:
    Can't sign in to Outlook on the web or EAC if Exchange Server OAuth certificate is expired

    You may need to wait for some time for the new certificate to take effect.

    In addition, here are two threads about this issue for your reference:
    Exchange 2013: After KB5004778 update, unable to access OWA & ECP (http code 500)
    Exchange 2019: EX2019-CU10 OWA/ECP not working after July Security Update

    And this issue is also mentioned in this article:
    Released: July 2021 Exchange Server Security Updates
    Please refer to the Known issues in July 2021 security updates part.
    131629-24.jpg

    If the response is helpful, please click "Accept Answer" and upvote it.
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