Can remote Windows clients connect to L2TP/IPsec server on xserve/10.3???

[dev@teraflux]

I have searched the vast store of information on this site and many others for any tips on how to get a remote windows client to connect to my xserve using the built-in L2tp/Ipsec server. Info seems very sparse on the topic with more questions than answers. Any help would be appreciated. Here is what works for me now:

*Mac OS 10.3 clients can connect through VPN from anywhere.
*XP clients can connect on the local lan
*Remote XP clients can connect via a dialup connection

Any remote XP or W2k3 server machine fails to connect over L2tp/ipsec if it is in a remote location connecting through cablemodem, even if there is no router/firewall between the machine and the cable modem. I also disabled the windows firewall.

We are testing this from a home office for now so the xserver is also on a cable modem connection, but the problem persists regardless of whether the server is in a dmz or directly behind the modem. It will ultimately end up in a colo.

I am about ready to give up on this. Please advise or give any tips/pointers as to what to look for.

thanks.
Perry

[Author]

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