i got mine pptp vpn to work. setup everything as necessary on your firewall. then login to the comcast router -> Advanced -> Port Forwarding -> Add Service Other = PPTP Protocol = TCP & UDP (TCP should be able to work, but I had problems with that.) Start Port = 1723 End Port = 1723 Server IP = (leave default. This IP should be the WAN interface to your firewall.) Test and done if your firewall is setup correctly.
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