Oh cool, thanks. Well, at this point I don't need that any more since my VPN seems to be working.

I had to pinhole TCP port 1723 because that's the PPTP connection port. And then for some reason or other, I had to go into the router's configuration and set a pinhole for "Protocol: PPTP" but it didn't seem to matter what port number I set that to. I didn't realize that PPTP was a "protocol" like TCP or UDP is. Not exactly sure what the router is doing in that case.

Anyway, it works now but I've got the nagging doubt that somehow the Windows VPN server isn't the most secure thing in the world and that someone out there might be able to gain access to the server via VPN.

I've got a couple of bugs I need to work out, too... For instance, name services don't seem to work, I can't locate the server by name after I've VPN'd into it. Also, I can't seem to get two VPN tunnels working from my house at the same time. Maybe it's because we're both behind a NAT layer here.