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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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