Fail to establish vpn connection between two xp professional by pp

[Guest]

Hi All
I try to setup vpn connection between two XP Professional by PPTP.
However, when make a connection from client side.
The error found "Error 721: The remote computer is not responding."
Why???
*I connect to internet by boardband line.
*VPN server side is connected to internet directly.
*VPN client side is behind NAT router.
Anyone can help me?
Many Many Thanks

 

[Robert L [MS-MVP]]

quoted from http://www.ChicagoTech.net
Error 721: Remote PPP peer or computer is not responding. If you have tried
many thing other people suggest like rebooting, reloading hardware and
re-installing the VPN or dial in connection, you still get the same problem.
I will suggest to check the router settings and make sure TCP Port 1723, IP
Protocol 47 (GRE) are opened. Also make sure that the router has the PPTP
enabled and not firewall block the traffic. On the RAS server, check the
DHCP settings.

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