outlook 2019 cannot connect to exchange 2016

Question

i 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

Answer 1

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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