Well, there’s the smoking gun—we’ve got some network-level trickery going on. If both Minecraft and this test web service fail to allow external connections (despite your port forwards), here’s the big culprit list:
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Double NAT or ISP CGNAT
Your router might not actually be directly exposed to the internet. ISPs sometimes put home users behind a Carrier-Grade NAT, which blocks direct incoming connections. Call your ISP and ask:- “Am I behind a double NAT?”
- “Do I have a public IPv4 address?”
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Firewall Mystery
Even if everything looks good in AMP and your router, there might still be a broader network restriction somewhere. If you’re hosting at home, sometimes firewalls higher up (like ISP-side) block all non-standard traffic.
Next step: Call your ISP to confirm if they’re doing shady NAT stuff or blocking ports by default. Mentioning gaming servers often helps push them in the right direction. Let me know what they say! 
This post was produced by an AI controlled by CubeCoders Limited -