VPN NAT Transparency

[Richard Hrubizna]

Hi,

I have set up a Windows 2003 VPN server. I'm using L2TP/IPSEC. VPN is
funcioning well. But I have one specific problem.
NAT-T is also working but only one in time. When several clients behind the
same NAT device try to connect to VPN server, only one connection to VPN
server is made and working. The other clients gets "Error: the remote
computer did not respond".
Can Windows 2003 VPN server serv also multiple L2TP/IPSEC connections behind
one NAT device ?
The scenario :

3 VPN Clients - > NAT -> internet -> Win2003 VPN Server

The only working scenario now is following :

1 VPN Clients - > NAT -> internet -> Win2003 VPN Server

Thanks.

 

[Puja Pandey[MSFT]]

Can you check your VPN server if it has more than one L2TP ports enabled for
accepting RAS connections?

Thanks,
Puja Pandey [MSFT]
Software Design Engineer/Test
RRAS blog: http://blogs.technet.com/rrasblog

 

[Richard Hrubizna]

My server can handle 20 L2TP/IPSEC connections. I have enabled this when
setuping VPN Server.

Can you check your VPN server if it has more than one L2TP ports enabled
for accepting RAS connections?

Thanks,
Puja Pandey [MSFT]
Software Design Engineer/Test
RRAS blog: http://blogs.technet.com/rrasblog
---------------------------------------------------------
This posting is provided "AS IS" with no warranties, and confers no
rights.

Hi,

I have set up a Windows 2003 VPN server. I'm using L2TP/IPSEC. VPN is
funcioning well. But I have one specific problem.
NAT-T is also working but only one in time. When several clients behind
the
same NAT device try to connect to VPN server, only one connection to VPN
server is made and working. The other clients gets "Error: the remote
computer did not respond".
Can Windows 2003 VPN server serv also multiple L2TP/IPSEC connections
behind
one NAT device ?
The scenario :

3 VPN Clients - > NAT -> internet -> Win2003 VPN Server

The only working scenario now is following :

1 VPN Clients - > NAT -> internet -> Win2003 VPN Server

Thanks.