Server stopped working after Windows 11 25H2 update + WSL install — connection timed out from outside network

[/u/Local-Reindeer-679]

My Minecraft server (Paper 1.21.11) was working fine all week. Today I updated Windows 11 to 25H2 (build 26200.8655) and installed WSL. Now nobody can connect from outside my network.

What still works:

• localhost connects fine
• 192.168.10.12:25565 (local IP) connects fine from inside the network
• Server starts clean, no errors in logs

What doesn't work:

• Public IP / domain (pdf-talon.gl.joinmc.link) — times out for everyone outside my network
• Zero connection attempts appear in the server log when friends try

What I've already tried:

• Added inbound Allow rule for TCP port 25565 in Windows Firewall ✓
• Set Hyper-V firewall DefaultInboundAction to Allow (Set-NetFirewallHyperVVMSetting) ✓
• Changed network profile from Public back to Private ✓
• Router port forwarding: external 25565 → 192.168.10.12:25565, TCP/UDP ✓
• Restarted PC and server ✓

Router: Gilat ONU

OS: Windows 11 Pro 25H2, build 26200.8655

Server: Paper 1.21.11-69

Any idea what the 25H2 update or WSL install could have broken for inbound connections?

submitted by /u/Local-Reindeer-679
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