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Sometimes when I’m setting up a new server and creating a site using only integrated security I am unable to access the site.
Instead of direct access to the site, a dialog pops up asking for user name and password. Even if I enter a valid domain user and the correct password no access is given [...]

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” [...]