Error Message:
Msg 4621, Level 16, State 10, Line 1
Permissions at the server scope can only be granted when the current database is master
This message occurs when the Server scope permissions are tried to be modified from any other database other than master.
Example:
USE AdventureWorksDW2008R2 GRANT VIEW SERVER STATE TO USER1
USE AdventureWorksDW2008R2 REVOKE VIEW SERVER STATE TO USER2
Fix/Resolution:
Change the database to master.
USE MASTER GRANT VIEW SERVER STATE TO ABC