Because I access my home PC with Remote Desktop every day, it already has an always-on wired connection with a DHCP reservation so the LAN IP won't change and the port forwarding rules will not break.
Well, I tested on 2 Windows 10 systems and neither of them show anything listening on port 1723 when I run netstat -a
Went through the same setup on a Windows 7 system and it worked perfectly fine. Did Microsoft break this with Win10? Any chance the functionality was intentionally limited or removed?
From the iPhone, I can connect to the Windows 7 test VPN over LAN or WAN (only with the default port number 1723). The iPhone could not connect to the Windows 7 test VPN through any alternate external port number. I configured several in the 4,000s and configured the iPhone with [wanIP]:[port], but it wouldn't connect. I don't know if that's a problem with my router or a limitation of the iPhone VPN client. Perhaps the iOS VPN client doesn't interpret the host:port syntax