Connectivity Problem with Valheim - Valheim instance does not start with an open game port

System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Callisto’ v2.5.0.8 (Mainline)
Virtualization Docker
Application Valheim
Module GenericModule
Running in Container Yes
Current State Ready

Problem Description

Issue

The “Game Port” (2456) does not come online after starting a Valheim instance.

Reproduction Steps

  • Create Valheim instance
  • Start Valheim instance
  • Notice the “Game Port” remains red
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