outlook 2019 cannot connect to exchange 2016

Samuel Sefeen 1 Reputation point
2022-11-24T10:22:30.583+00:00

263750-error.jpgi have exchange server 2016 cu 22 and it was working vey well without any problem then i made the mitigation steps as it mentioned in the link

https://msrc-blog.microsoft.com/2022/09/29/customer-guidance-for-reported-zero-day-vulnerabilities-in-microsoft-exchange-server/

i can't login through outlook 2016,2019 then i remove all the steps and update my exchange with the latest update of 8/11/2022 but the problem still the same

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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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. LilyLi2-MSFT 1,981 Reputation points
    2022-11-25T06:11:48.857+00:00

    Hi @Samuel Sefeen ,

    Welcome to our forum.

    How did you remove the mitigation?
    If an admin removes a mitigation but does not block it, the EM service will reapply the mitigation when it performs its hourly check for new mitigations.

    You can run the following command to block the mitigation, then manually removing it. 

    Set-ExchangeServer -Identity <ServerName> -MitigationsBlocked @("M1")  
    

    If this error persists, it is recommended that you temporarily disable EM service.

    Set-OrganizationConfig -MitigationsEnabled $false  
    

    For more information about the Exchange Emergency Mitigation (EM) service, please refer to exchange-emergency-mitigation-service

    Besides, the mitigations are no longer recommended, and you can simply install the November 8, 2022 update.


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