IPsec VPN connection from Win XP SP2

From: Dennis (archer_uk_at_hotmail.com)
Date: 03/08/05 

Date: Tue, 8 Mar 2005 16:39:22 -0000

Hi
I have VPN connection like below
Win XP SP2----> NAT-1 ----Internet----> NAT -2 ----> Win 2003 Server.

I can connect to my Server when i use the PPTP .It works perfectly .
But now i would like to connect to my server with IPsec L2TP .

I open ( Nat-2 ) the UDP 500 , UDP 1701 , UTP& TCP 1723 and 50 and 51
port on and forwarded to win 2003 server Ip address.And also i activeted
the IPsec Pass Thourgh and PPTP pass thourgh option on my (
Nat-2 )router.( do i stiil open the port 47, port 50 and 51 even i
activated the IPsec pass and PPTP pass thourgh option?). I haven't done
anything on my Win XP sp2 client site router. I just enter the
AssumeUDPEncapsulationContextOnSendRule , value 2
Word key under the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSec subkey.
Then i created the VPN connection from Connect to menu .Then I open
the properties ,select the Security tab and chose the IPSec Setting and
enter the Preshare key which i wrote on the win 2003 server. i don't use
the cert. now .I just use the Preshahere key at the moment.Then i went to
Networking Tab and select the L2TP Ipsec for Type of VPN . i tried it
but i doesn't work .

If i cancel the Pre share key and chose the PPTP type connection i am able
to connect to VPN server.Do i have to do something on win xp client side
network .

Any idea ?

Thank you very much in advance.

Dennis

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