ER605 Router VPN traffic from Mexico being blocked
I set up Internet service and a network for my bosses home with an ER605 router and one of our business WAN IP's.
I set up a PPTP VPN connection for him to connect to the network. The goal is for him to connect to the network and check the temperature in his home. He connects to the VPN and then to a computer in his home using either RDP or UltraVNC.
I am able to connect to the router from my home internet service and both cell phone hotspots. I can then RDP or VNC to the computer with no problem.
He can connect to the router from his home in Mexico but both the RDP and VNC connections fail.
I checked the log and it doesn't show anything other than him connecting to the VPN.
If anyone could point me in the right direction I would greatly appreciate it.