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Prepare Forest Active Directory settings execution failed on an unrecoverable error.


Issue: Unable to prepare Forest for Lync Server 2013.

Error: Prepare Forest Active Directory settings execution failed on an unrecoverable error.
 ForestPrepareTask execution failed on an unrecoverable error.  
 
Problem Statement:
When you start preparing forest it will start after few second it will complete with error.

You will see above error message.  If you view the log from C:\Users\baluilag\AppData\Local\Enable-CSAdForest-[2014_02_09][22_29_24].html”.

Resolution:-
Open: C:\Users\baluilag\AppData\Local\Enable-CSAdForest-[2014_02_09][22_29_24].html

Got to detail result page and see error message.
 
Error message will say you that, The user is not a member of “Enterprise Admins” group.

Go ahead and add user (who is preparing forest) to ‘Enterprise Admins’ group. See the below figure it will give clear picture to add user to Enterprise group.
See the attached screenshot- 
 
Thank you.

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