Connectivity Problem with Garry's Mod - Cannot connect to instance in spite of port forwarding

System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Phobos’ v2.6.0.12 (Mainline)
Virtualization None
Application Garry’s Mod
Module GenericModule
Running in Container No
Current State Stopped

Problem Description

Issue

I can connect in my local network by directly addressing the local ip of the nas running AMP. However, if I do that with the public IP it gets rejected. Other port forwardings (i.e. for my web server) work.

Reproduction Steps

  • Setup Garry’s Mod instance
  • Forward all ports listed from my FRITZ!Box 7490 to the device running the server.
  • Try to connect via ddns-domain or public ip directly.
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