5G Router Port Forwarding
Enthusiast - Level 1

I'm looking to host some Minecraft on a unix system (Debian; MineOS) for some friends. My friends can connect with the direct URL or DNS, but I cannot do the same with the public URL.

I suspect the severely-limited-settings router with the restrictive firewall options is the culprit after days of testing. I would like to be wrong.

iptables is configured to allow connection:

  in /etc/iptables-rules:
  -A INPUT -p tcp -m tcp --dport 25565 -j ACCEPT

  From iptables --list
  ACCEPT tcp -- anywhere anywhere tcp dpt:25565

The port is visible from https://canyouseeme.org/ ("Success: I can see your service on xx.xxx.xxx.xxx on port (25565)
Your ISP is not blocking port 25565")
I am able to connect locally over LAN. But for testing purposes, I want to connect via public IP address.



The IP is static:




The ports are open


This is not an issue I have had with Verizon FiOS service & routers in the past. Input on this would be appreciated.