Connectivity Problem with Minecraft Bedrock - can't connect to minecraft server

System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Proteus’ v2.8.0.4 (Mainline)
Virtualization QEMU_KVM
Application Minecraft Bedrock
Module GenericModule
Running in Container No
Current State Ready

Problem Description

Issue

Can’t connect to running Minecraft instance. UDP port appears to be listening but incoming connections aren;t working. tcpdump on server shows testg UDP packets coming in.

Reproduction Steps

  • connect to server IP:port, times out
  • reloaded and updated server, still no connection from client
  • restarted server, and still connection from windows and android clients fail

You need both TCP and UDP on 25565.