Enrolling the instance. Step failed. An exception occurred while executing a Transact-SQL statement or batch.

Failed Operation to Enroll an Instance of SQL Server into a SQL Server Utility

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If you connect to the instance of SQL Server to enroll using SQL Server Authentication, and you specify a proxy account that belongs to a different Active Directory domain than the domain where the UCP is located, instance validation succeeds, but the enrollment operation fails with the following error message:
An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)
Additional information: Could not obtain information about Windows NT group/user '', error code 0x5. (Microsoft SQL Server, Error: 15404)
This issue occurs in the following example scenario:

1. The UCP is a member of "Domain_1."
   
2. A one-way domain trust relationship is in place: that is, "Domain_1" is not trusted by "Domain_2" but "Domain_2" is trusted by "Domain_1."
   
3. The instance of SQL Server to enroll into the SQL Server Utility is also a member of "Domain_1."
   
4. During the enroll operation, connect to the instance of SQL Server to enroll using “sa”. Specify a proxy account from "Domain_2."
   
5. Validation succeeds but enrollment fails.
   

The workaround for this issue, using the example above, is to connect to the instance of SQL Server to enroll into the SQL Server Utility using “sa” and provide a proxy account from "Domain_1."

1. Connect utility using SA
2. For enrolling use Domain 1 usr and pwd



More On  :- http://msdn.microsoft.com/en-us/library/ee210592.aspx