When you attempt to connect to another domain computer using the GP Results Wizard. It fails with following error :

Failed to connect to Domain\Computer due to the error listed below. Ensure that the Windows Management Instrumentation (WMI) service is enable on the target computer and consult the event log of the target computer for further details. Refer below image. Details:  The RPC server is unavailable.

RPC uses port 135 and 445. Firewall blocking the RPC traffic. So we have to enable the Remote Administration Firewall Rule.

Windows XP / Windows Server 2003

For Windows 7/Windows Server 2008 uses following command at the system prompt:

netsh More >