Monthly Archives: April 2020

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Exchange 2013 CU 23 error during installation…”Couldn’t resolve the user or group “domain.ESES/Microsoft Exchange Security Groups/Discovery Management.”

Today I had to install a new Exchange 2013 CU23 environment.

I have started the Exchange 2013 CU 23 but the installation fails on the Mailbox Server Role with the following error “Couldn’t resolve the user or group “domain.ESES/Microsoft Exchange Security Groups/Discovery Management.”

If the user or group is a foreign forest principal, you must have either a two-way trust or an outgoing trust. The trust relationship between the primary domain and the trusted domain failed. 

Strange behaviour, because the Active Directory is healthy and there are no errors in the Event Viewers. I’ve performed the following steps.
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Automount consensus not reached : Databases Dismounted

[PS] C:\>Get-MailboxDatabase | Mount-Database -Force

Failed to mount database “DB”.
Error: An Active Manager operation failed. Error: An Active Manager operation encountered an error. To perform this operation, the server must be a member of a database availability group, and the database availability group must have quorum. 

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