Question : vpn hangs on verifying username and password

I have a w2003 sbs server that I have enabled RAS on. I moved office and had to switch internet providers to comcast.  Now when I enable port 1723 to forward to my server I unable to connect to the VPN.  The vpn hangs on verifying username and password.  I get the error 721 when it fails.  I was woundering if anyone has used the comcast bussines gateway to setup this type of coneection.  It is an SMC router.  I have also forwarded port 47 for both tcp and udp but I do not have a GRE protocal so the tcp and udp is the best I have.  

Any ideas would be great.

Thanks is advance
Chad

Answer : vpn hangs on verifying username and password

When you tested was the client off site ? Testing internally is not sufficient.
Did you try the canyouseeme test for basic PPTP forwarding?