RPC Server Unavailable in Group Policy Results Wizard

There are some customers who run SBS 2003 domains, as well as customers who run Windows 2003 domains. The problem only seems to occur for the SBS 2003 Premium customers. If I am trying to run the "Group Policy Results Wizard", then I am getting an error message stating "Failed to connect to "computername" due to the error listed below. Ensure that the Windows Management Instrumentation (WMI) service is enabled on the target computer, and consult the Event Log of the target computer for further details." And then it will also say "Details: The RPC server is unavailable."

Can anybody help me out? Thanks

I have found a solution for this problem, I would pertain to those using SBS 2003 with ISA 2004. The RPC port 135 is being blocked - by the Microsoft Firewall Client for ISA 2004. To unblock, do the following:

1. First of all go to ISA Server Management
2. Browse to "Firewall Policy"
3. Select "Edit System Piolicy"
4. Browse to "Active Directory" under "Authentication Services"
5. Unchek the box titled "Enforce strict RPC compliance"
6. Click OK
7. Apply the new settings