Enabling incoming VPN connection in NIS2011

Hi all

 

I've had no end of fun setting up my XP Pro PC to accept incoming VPN connections, using PPTP via port 1723. Everything works fine if I turn off Norton Firewall, even with Windows Firewall running. But the moment NIS Firewall is active, it stops any VPM connections.

 

I've searched other threads, and I can see that I can choose to turn off just the "stealth blocked ports" feature within Firewall settings but others suggest this leaves a big hole in security.

 

So, how can I configure NIS2011 to allow incoming VPN connections, via PPTP and port 1723 ?

 

Thanks