Cannot connect to friend's internet network
I am trying to connect to my friend's gaming server (correctly port forwarded) and 2 other friends can connect to said server except me. He is also able to connect to my server but only with a hot spot and not with his main internet. All other IPs work besides his IP in this game.
When I try pinging his IP it fails and pings the default gateway while stating "Reply from 10.0.0.1: Destination port unreachable." However, when he pings my IP, he gets a response.
I have tried turning off Windows Firewall, Internet Firewall, and Advanced Security. He does not have any firewalls or advanced security on currently.
Any help is appreciated!