So the weirdest thing..  Up until today, I was able to VPN into a new SBS 2003 server.  The last thing that changed about 2 days ago was getting a reverse pointer set up for Exchange.  As of about 24 hours ago, VPN has semi-stopped working and gives an error.

It has something to do with a Linksys router, either at my end, the servers end, or both.  Both routers are updated to their latest firmware (just recently in troubleshooting this problem).

If I bypass the Linksys router at home and go directly into the Cable Modem, the VPN works.

I also tested it out on another network that uses a Sonicwall Firewall + DSL, and that works too.

But at my home, using this Linksys Router over Comcast cable, I get an error 619 as of Today when I try to establish a MS PPTP VPN.  It hangs up at Verifying Username and Password.  Again, if I go directly into the modem, it works -- and VPN Passthrough is set correctly on the routers.  The port forwarding on the servers end is fine, obvious if it works in other scenarios.  

I have also tried connecting to the direct public IP of the  SBS Server and I've tried the Public DNS name as well.

Ideas??