[...] After our previous attempts to get Windows 2003 SP1 installed, we rolled the upgrade back because the VPN was more important than SP1. Over time priorities change, and we finally installed SP1 and tried to debug the VPN properly. [...]

That also fixed the problem I had with the fax service on XP Pro…Thanks Mike!

Yay, All fixed. Thanks Mike!

I found a solution to the fax problem. Look at http://support.microsoft.com/default.aspx?scid=kb;en-us;897342

The article is related to Windows Small Business Server 2003 but addresses a similar problem near the bottom: “If you remove Windows Server 2003 SP1 on a computer that is running Windows Small Business Server 2003, the Fax service does not start and the Fax Configuration Wizard does not complete.” While the error message is different, the solution works. Follow the instructions and make sure to reboot. When the system comes back up the registry entry you changed may no longer have the value 0 like you just set it, but the fax server reinstalls and can be configured properly. I hope this helps you.

I have the same problem with the fax service. It died sometime around when I installed SP1 (and then had to un-install it). Unfortunately, I haven’t yet found a way to fix it.