VPN setup

Hi,

I want to use the school’s VPN connection but it does not work and I think Comodo is blocking it. What needs to be opened according to the school is:

Client ports: 1024-65535/TCP
Server port: 1723/TCP
Protocol: PPTP
Allow: IP PROTOCOL 47 (GRE)

Now, what I have already done is allow the host domain in Network Zones, but where must I go to set rules for the ports and the GRE protocol?

Thanks in advance.

Regards,
John.