Question please help, Unsolved mystery: peer-to-peer impossible with ONLY one person

Jan 3, 2020
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I have had this issue for years:
any p2p-based game does not allow me to play with one specific friend of mine. He can play with others and I can play with others, but if we try to play together the game does not work. We do not have eachother blocked on our firewalls, we have tried uPnP, we have tried rerolling to older versions of Windows, and we have tried port forwarding. It seems as if our ISPs are simply blocking communication between us.

Connecting to servers and communicating via them works perfectly.

I should also mention that the issue is related to our networks: while at our respective colleges we are able to game together perfectly fine. The issue returns when we come home. He completely rebuilt his network from the ground up recently, and the issue persists.
 
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