Windows Firewall / Group Policy / VPN over PPTP

Hi all
I wanted to check on how I can set Group Policy to allow VPN access
from the clients to our network
Currently if the user is on the LAN Windows Firewall is disabled, if
they are not on the LAN it is enabled. This is set via Group Policy,
nothing to unusual there!
What I am finding is that some users are not able to VPN using the
inbuilt MS PPTP client to our network. the RRAS error they get is 800
which appears to be firewall related
What do I need to set in Group Policy to allow the XP workstations to
access our PPTP server
I have added the following port exceptions under the following section
Windows Firewall: Define port exception Properties
1723:TCP.*.enabled:VPN Service
47:GRE.*.enabled:VPN Service

Is this all I need to add to allow PPTP connections thru the Windows
firewall?

Any suggestions would be most welcome

Regards,

Scott
.

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