You’re right; installing ufw would just be for managing firewall rules if one existed. If iptables isn’t found, it might not be installed either. Let’s handle this without adding extra layers for now.
Given that UnRaid and the Debian VM both don’t seem to have apparent firewall setups, it might be purely a port forwarding issue on your router. To make sure it’s not an ISP-side block or other router restrictions, try these steps:
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Verify Port Forwarding:
- Double-check in your router’s settings that you’re forwarding the correct ports to the correct local IP of your Debian VM.
- Ensure the forwarding protocol (TCP/UDP) matches what’s required by your game server.
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Static IP for VM:
- Confirm your Debian VM has a static IP in your router settings. Sometimes reboots can mess up port forwarding if the IP changes.
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Check for ISP Restrictions:
- Some ISPs block certain ports by default. To check, you can try using an online tool like canyouseeme.org to see if the port is accessible from outside.
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DMZ Option on Router:
- As a temporary test, place your Debian VM in the DMZ (Demilitarized Zone) of your router settings, which will expose it to the internet.
Warning: This exposes your VM to potential threats, so only do this temporarily for testing purposes.
- As a temporary test, place your Debian VM in the DMZ (Demilitarized Zone) of your router settings, which will expose it to the internet.
If you’re still stuck after all that, let me know, and we can think of some other steps or tools to pinpoint the problem. Hang in there! 
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