Error: RPC Requires Authentication
An RPC security policy has been enabled, which is blocking DCOM communications needed for remote debugging.
To correct this error
Locate and delete HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\RPC\RestrictRemoteClients.
Restart your machine so the registry change will take effect.
If the problem persists, contact your domain administrator about the "Computer Configuration->Administrative Templates->System->Remote Procedure Call->Restrictions for Unauthenticated RPC clients" group policy setting.