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CGNAT Explained: Why Port Forwarding Fails
NetworkingBeginner
What CGNAT is
CGNAT puts many homes behind a shared public IP. Inbound port forwards never reach your PC reliably. UPnP cannot invent a path the carrier does not give you.
The managed fix
Host the game on GlassHosting. Friends connect to datacenter allocations; you stop fighting the ISP. Related: Router and CGNAT issues, port forwarding myths.
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