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Sometimes I need to read performance counters from a machine in a different domain when I run load tests. This can be done in a few easy steps on the target machine:

Enable the guest account
Add the guest account to the Users and Performance Monitor Users group

This will also remove the “Unable to connect to machine” [...]

Bill Barnett has posted a great article that describes the data model of the load test result store. This is all you need if you want to create your own custom reports.

http://blogs.msdn.com/billbar/articles/529874.aspx