port 445 blocked by Group Policy
Solution 1:
As with many Group Policies, the setting are stored in a Policies key in the registry. The Windows Firewall machine policy key is located at: HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall
If you delete this key the "old" GP firewall settings are gone. If you restart the machine, it should able to pull down a fresh copy of your firewall GPO.