VPN, NAT and Multiple Connections

Hello,

I have a LAN behind a NAT firewall, on the external side of the NAT there is
a VPN server. One person can connect to the VPN with no problem, when the
second person connects it times out on the "Verifying Username and Password"
box.

The VPN server is Microsoft Server Standard 2003, the VPN server is running
though Routing and Remote Access. All I can guess is that it sees VPN
requests coming from the same NAT IP, it allows the first one but no others.

Is there something I need to change on the VPN server?
Is this a NAT issue?

Any help please.

Thanks,

Peter

Assuming you have a router/firewall, it could be the router/firewall issue. these search result may help,

VPN Issues Some routers may take just one VPN connection The connection to <connection_name> made by user <user_name> using device <com_port> was disconnected. ...
www.chicagotech.net/vpn.htm


Laptop can't VPN while desktop can Some routers may take just one VPN connection ... Cause: Some router takes only one connection. VPN connection appears with a red X ... ...
www.chicagotech.net/VPN/vpnrouter.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
"bushnell" <(E-Mail Removed)> wrote in message news:6B41B233-6E61-4AB6-B40C-(E-Mail Removed)...
Hello,

I have a LAN behind a NAT firewall, on the external side of the NAT there is
a VPN server. One person can connect to the VPN with no problem, when the
second person connects it times out on the "Verifying Username and Password"
box.

The VPN server is Microsoft Server Standard 2003, the VPN server is running
though Routing and Remote Access. All I can guess is that it sees VPN
requests coming from the same NAT IP, it allows the first one but no others.

Is there something I need to change on the VPN server?
Is this a NAT issue?

Any help please.

Thanks,

Peter

Yep, it must be a firewall issue. Am running an OpenBSD firewall, think I am
going to have to setup NAT Proxying.

Thanks