Connectivity Problem with Minecraft - Forge version fails to download and doesn't appear

System Information

Field Value
Operating System Linux - Debian GNU/Linux 13 on x86_64
Product AMP ‘Deimos’ v2.7.2.8 (Mainline)
Virtualization Docker
Application Minecraft
Module MinecraftModule
Running in Container Yes
Current State Stopped

Problem Description

Issue

The server instance is unable to reach the Forge version repository or download the necessary files. I’ve tested various Forge versions, but only the following files successfully downloaded and populated the Server JAR dropdown: forge-1.21.1-52.1.1-shim.jar and forge-1.20.4-49.0.42-shim.jar. Please verify that the firewall and network settings allow outbound connections on ports 80 and 443, and that release streams are properly updated.

Reproduction Steps

  • Set the Server Type to ‘Forge’.
  • Selected the specific Minecraft and Forge versions.
  • Clicked the ‘Download/Update’ button, but no files appeared in the Server JAR dropdown.