Routing and Remote Access on Windows 2003 Server

I am trying to enable VPN for a client. I have 2 domain controllers in one
site. I enabled routing and remote access on my domain controller and
enabled NAT & the VPN option. However when I test the VPN with another
client it fails with the Error 800: The VPN server may be unreachable, or
security parameters may not be configured properly for this connection. Any
idea why I am getting this error message? Both my domain controllers have 2
NICS in them. One for the LAN and one for the public Internet.

quoted from http://www.ChicagoTech.net
Error 800: Unable to establish the VPN connection. The VPN server may be
un-reachable, or security parameters may not be configured properly for this
connection.

Resolutions:
1) if you have firewall, open TCP Port 1723, IP Protocol 47 (GRE).
2) make sure you can reach the VPN server by using ping. Sometimes, poor
connection can cause this issue too.
3) You may need to updated firmware on a router or firewall if other OS
(win9x/nt/me/w2k) works except XP.
4) The VPN server may not be able to get IP from DHCP for the VPN client.
So, you may want to re-configure VPN host networking settings. For XP pro
VPN host, go to the Properties of the VPN>Network, check Specify TCP/IP
address and Allow calling computer to specify its own IP address, and
uncheck Assign TCP/IP addresses automatically using DHCP.
5) Make sure other secure software blocks your access, for example, if you
use Norton secure software, you may need to add the remote client's IP so
that the client can access.
6) If your VPN running on a Windows RRAS with NAT enabled, you may want to
check the NAT settings.


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Bob Lin, MS-MVP, MCSE & CNE

Networking, Internet, Routing, VPN, Anti-Virus, Tips & Troubleshooting on
http://www.ChicagoTech.net
This posting is provided "AS IS" with no warranties.

"Server guy" <Server (E-Mail Removed)> wrote in message
news:92AE548B-AC2D-4F86-97DC-(E-Mail Removed)...
>I am trying to enable VPN for a client. I have 2 domain controllers in one
> site. I enabled routing and remote access on my domain controller and
> enabled NAT & the VPN option. However when I test the VPN with another
> client it fails with the Error 800: The VPN server may be unreachable, or
> security parameters may not be configured properly for this connection.
> Any
> idea why I am getting this error message? Both my domain controllers have
> 2
> NICS in them. One for the LAN and one for the public Internet.