Hi,
See this link:
http://www.cisco.com/en/US/tech/tk827/tk369/technologies_configuration_example09186a00800949c0.shtml
Check the configuration of the router House:
!--- Static port translation for the Microsoft PPTP server on TCP port 1723
!--- share one public IP address (the address on Fa0/0)
ip nat inside source static tcp 192.168.50.2 1723 interface FastEthernet0/0 1723
P.S.
Remember
If you have built a FW, you have to open port 1723.
Best regards,
MB
________________
Best regards,
MB