If its that NAT causing the problem, consider using IPSec with NAT-T instead

IPSec NAT traversal (NAT-T), a new standard for allowing Encapsulating
Security Payload (ESP)-encapsulated traffic across one or more NATs.
IPSec NAT-T is described in the Internet drafts titled UDP
Encapsulation of IPSec Packets (draft-ietf-ipsec-udp-encaps-02.txt)
and Negotiation of NAT-Traversal in the IKE
(draft-ietf-ipsec-nat-t-ike-02.txt). IPSec NAT-T defines changes to
IPSec protocols and new Internet Key Exchange messages and payloads
that are exchanged between two IPSec NAT-T-capable peers. IPSec NAT-T
must be supported by both the client and server.

Windows Server 2003 and Microsoft L2TP/IPSec VPN Client support IPSec
NAT-T. The L2TP/IPSec NAT-T Update for Windows XP and Windows 2000
provides VPN client IPSec NAT-T support for Windows 2000 and Windows
XP. For details about this update, see the Knowledge Base article
L2TP/IPSec NAT-T Update for Windows XP and Windows 2000

http://support.microsoft.com/default.aspx?scid=kb;en-us;818043

Cheers
Nathan Mercer

On Mon, 09 Aug 2004 22:19:24 +1200, John Morch <morchjohn@hotmail.com> wrote:
> Hi,
> Trying to get VPN going to a SBS2003 server with a RTA020. Just using
> standard XP professional laptops so its all "standard" microsoft.
> Has anybody achieved this?
> If not then what ADSL Routers has anyone used for this?
> Thanks
> John
>
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