Error:

If you trying to add a member server to an Exchange DAG you might encounter the following error:

Exchange 2010: adding a member server to an existing dag fails

The error is “The Authentication service is unknown”.

Solution:

Stopped the windows firewall service on both machines and set the startup to disabled. Rebooted the 2 exchange servers and ran wizard again to add the server to the DAG and it was successful.

Hope it helps.

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