Remote performance monitoring of one Windows 2003 server from another that had been working for many months suddenly stopped working. The only thing that had changed was a local administrator account password on the remote system.
In hopes of getting more information as to why remote monitoring was failing to start, I start up Perfmon and try to create a counter for the remote system. It reports "Unable to connect to machine". I was hoping for something more specific.
So, I try from a Windows 2008 system. It gets slightly more specific with "Access is denied."
While it is generally a good idea to not disclose details about failed authentication attempts, a bit more info could be helpful in resolving this problem.