Trouble connecting to PPTP VPN from a Windows XP computer

I am having problems getting OS X Server 10.6 to accept an incoming PPTP connection from a Windows XP Home client (I have had no problems connecting from an OS X client)
The error on the Windows side is "721" - Server did not respond.
The error in the VPN log is repeated several times until it timesout the connection attempt:
2010-06-03 15:35:16 EDT Incoming call... Address given to client = 10.110.128.103
Thu Jun 3 15:35:16 2010 : Directory Services Authentication plugin initialized
Thu Jun 3 15:35:16 2010 : Directory Services Authorization plugin initialized
Thu Jun 3 15:35:16 2010 : PPTP incoming call in progress from 'n.n.n.n'...
Thu Jun 3 15:35:16 2010 : PPTP connection established.
Thu Jun 3 15:35:16 2010 : using link 0
Thu Jun 3 15:35:16 2010 : Using interface ppp0
Thu Jun 3 15:35:16 2010 : Connect: ppp0 <--> socket[34:17]
Thu Jun 3 15:35:16 2010 : sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0x4b27d2d8> <pcomp> <accomp>]
Thu Jun 3 15:35:16 2010 : rcvd [LCP ConfReq id=0x0 <mru 1400> <magic 0x14ae1f30> <pcomp> <accomp> <callback CBCP>]
Thu Jun 3 15:35:16 2010 : lcp_reqci: rcvd unknown option 13
Thu Jun 3 15:35:16 2010 : lcp_reqci: returning CONFREJ.
Thu Jun 3 15:35:16 2010 : sent [LCP ConfRej id=0x0 <callback CBCP>]
Thu Jun 3 15:35:18 2010 : rcvd [LCP ConfReq id=0x1 <mru 1400> <magic 0x14ae1f30> <pcomp> <accomp> <callback CBCP>]
Thu Jun 3 15:35:18 2010 : lcp_reqci: rcvd unknown option 13
Thu Jun 3 15:35:18 2010 : lcp_reqci: returning CONFREJ.
Thu Jun 3 15:35:18 2010 : sent [LCP ConfRej id=0x1 <callback CBCP>]
I have not been able to find anything useful via Google and the forum here on any of those error messages.
Thank you!
~ Jeremy

Okay, I decided to start over -- I reformatted and decide to try L2TP w/ IPSEC.
Got it working from a Mac client.
But when I try and connect from Windows XP (tried from several machines, too), it just times out and this time nothing in the error log.
After I try it several times, it eventually starts repeating the following errors every 5 or 10 seconds, and once it gets stuck in this loop, I can't connect from OS X either!
2010-06-03 18:07:27 EDT Health control check: server is sick...
2010-06-03 18:07:28 EDT Health control check: server is back to normal...
I have tried turning off the firewall completely on Windows, on the server, and on the router (using DMZ). Nothing seems to help.
I am about ready to tear my hair out! I would greatly appreciate any input, suggestions, etc. Thanks in advance!

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