Re: VPN error 628
From: Jeffrey Randow (MVP) (jeffreyr-support_at_remotenetworktechnology.com)
Date: 04/17/04
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Date: Fri, 16 Apr 2004 20:22:26 -0500
PPTP uses IP Protocol 47 GRE and TCP 1723.
L2TP uses IP Protocol 50 IPSEC and UDP 500 (and others, depending on
what L2TP/IPSEC server you are using).
Note that you need a hotfix to enable a L2TP VPN connection over a NAT
connection (as well as a server that supports L2TP NAT-Traversal).
Jeffrey Randow (Windows Net. & Smart Display MVP)
jeffreyr-support@remotenetworktechnology.com
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On 16 Apr 2004 00:15:34 -0700, evan_child@hotmail.com (Evan Child)
wrote:
>Hello,
>I have a Windows XP Pro sitting behind a DSL gateway with NAT enabled.
>I have enabled on my gateway PPTP/L2P passthrough, which I understand
>is GRE 47. Additionally, I have forwarded port 1723 to the ip address
>of the vpn server.
>I also set the verify ip dword VerifyAddress in
>HKEY_LOCAL_MACHINE\(blah)\Class\{...}\0000 to 0. The purpose of this,
>as I understand it, is so that it doesn't try and verify the checksums
>on the packet when it appears to be coming from a source different
>from what the router says.
>However, when I try to connect to it from outside the network, it
>appears as though it is going to connect and then gives error 628:
>"The connection was terminated by the remote computer before it could
>be completed. For further assistance, click More Info....."
>
>Also, I know the user I'm trying to authenticate as has admin
>privileges.
>
>Does anyone have any other ideas as to what more I need to do to
>enable this?
>
>Thanks,
>
>Evan
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