Firewall
Xbox makes use of the advanced firewall feature in Windows, utilizing WFP (Windows Filtering platform).
Initially it looked like modifying the registry would be the way to go..
Turns out that for opening an incoming port you rather want to:
- Disable the firewall profiles (domain, public, private)
- Create a new WFP rule
Code how to accomplish that can be found in Solstice
See also: WFP - Microsoft docs
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