Connectivity Problem with Minecraft - Instance is live but can’t connect to the server in-game

System Information

Field Value
Operating System Linux - Ubuntu 24.04.3 on x86_64
Product AMP ‘Phobos’ v2.6.5.2 (Mainline)
Virtualization None
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Ready

Problem Description

Issue

My Minecraft server was functioning properly a couple of weeks ago, but now it won’t let me connect to it within Minecraft even though the AMP instance is live. I’ve checked the server IP and port to make sure that is correct and followed everything on the CubeCoders Diagnosing Connectivity Issues guide to check that the firewall is working properly, which it appears to be. Instance is running and listening as well.

Reproduction Steps

  • Started instance on AMP
  • Logged into game
  • (no connection) to server on game

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