Add User - Access Denied

Add User - Access Denied

Manage 33 computers and have had no problem with 30 of them.  1 cannot be added for some reason.  I get "Access Denied". 

I have read the referenced KB.  The "Enable Distributed COM" was already enabled, the "Enable DCOM Internet Services" was not.  What is an appropriate authentication level for each of the following.  
  1. Select an appropriate authentication level - left this alone as it was already checked
  2. Select an appropriate impersonation level -  was set at Identity.



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