I realize that forms of this question have been asked before but my problem persists. I am running an XP Pro computer behind a netgear RP614v2 router (with updated firmware). I have port forwarding through the router settings for port 1723. When connecting to the VPN it looks as if the client starts the handshake but then hangs up during verifying username and password and gives me Error 721.
From what I've read, I need to enable GRE Protocol 47 but I do not know where to start with that. Besides that, I am open to any suggestions. Thanks!