WRV54G is VPN built-in VPN. So that is OK and it should work for pass-through. Since you can establish the VPN in the LAN, the problem must be router. I have seen some cases like this one. For example, you enabled the VPN on the router and also setup pass-through VPN. That could be the issue. Another case is forwarding 1723 to a wrong server. this case studies have more details.
Case Studies – VPN error 721 and 800
Case 1: When a user attempts to access the Windows VPN server that is behind a Linksys WRT54G, he receives VPN Error 800 or 721....
http://www.chicagotech.net/VPN/vpncase800.htm
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com
"Candace Sparks" <(E-Mail Removed)> wrote in message news:ML2dnQuWU7s_GbzZRVn-(E-Mail Removed)...
I have posts about vpn issues over the past week or so, and I still do not
have a solution. I have a Linksys WRV54G router with Windows 2003 server.
I have set up remote access on the server and can access the server with a
VPN connection from inside the LAN. When I try to connect through the
router I get the 800 error, can't establish a VPN connection. I tried
another Linksys router, with the same result. I really have to get this
resolved for a client. What are others using for a router with the VPN
server?
Thanks for your help in advance!
Candace Sparks