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Exchange 2010 DAG – Using a Domain Controller as a Witness Server
This is my site Written by Grant on October 24, 2010 – 12:25 am

Using a domain controller as a DAG Witness Server is not recommended but sometimes unavoidable – especially in small and test environments. It may generate errors

To use a DC as a DAC Witeness Server:

1) Add your domain controller’s computer account to the “Exchange Trusted Subsystem” group  
2) Add the “Exchange Trusted Subsystem” group to the BUILTIN\Administrators group for the domain

This should stop errors when using a domain controller as the Witness Server.

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