Yesterday I was able to use Activity monitor in 2012 management studio to view Activity on SQL Server 2008 R2. I installed 2012 SP 1 now I get access denied on the Servers that I connect to with domain authentication. Servers connected to with SQL Server authentication still work, and 2005 management studio Activity monitor still works. Other users who have not installed SP1 are still able to run activity monitor through 2012 management studio. I can connect to the servers, and run queries on user tables, just cannot run Activity Monitor. Does not make a difference if I run management studio as administrator, same results.