Upgrade from CU19 to CU23 faild diuring Prerequisite Check

Question

During the upgrade to Windows Exchange from CU19 to CU23 we gaet this fail message:

Copying Files...
File copy complete. Setup will now collect additional information needed for
installation.

Performing Microsoft Exchange Server Prerequisite Check

Prerequisite Analysis FAILED
The Active Directory schema isn't up-to-date, and this user account isn't a
member of the 'Schema Admins' and/or 'Enterprise Admins' groups.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150
)/ms.exch.setupreadiness.SchemaUpdateRequired.aspx

Setup encountered a problem while validating the state of Active Directory:
The Active Directory schema version (15333) is higher than Setup's version (153
12). Therefore, PrepareSchema can't be executed. See the Exchange setup log for
more information on this error.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150
)/ms.exch.setupreadiness.AdInitErrorRule.aspx

The forest functional level of the current Active Directory forest is not W
indows Server 2003 native or later. To install Exchange Server 2013, the forest
functional level must be at least Windows Server 2003 native.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150
)/ms.exch.setupreadiness.ForestLevelNotWin2003Native.aspx

Either Active Directory doesn't exist, or it can't be contacted.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150
)/ms.exch.setupreadiness.CannotAccessAD.aspx

We checked that our admin account is member of the 'Schema Admins' and/or 'Enterprise Admins

Answer 1

Hi @CashMaker

Please download and run the SetupAssist.ps1 script from this link: SetupAssist.ps1
It would check the possible causes of installing problem.

In addition, can the Exchange server access the domain controller currently?

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