Connectivity Problem with Minecraft - One Player is not able to Connect

System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Callisto’ v2.5.0.6 (Mainline)
Virtualization QEMU_KVM
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Ready

Problem Description

Issue

Everyone can Connect except for one Player that gets an timeout every time he connects

Reproduction Steps

  • Create Server
  • Port Forwarding 25565 in Router to Firewall (NAT to Server)
  • DynDns is enabled on the Router and Works

This is common when a player doesn’t have a good internet connection or they’re in another country, etc.
What server type are you running? There’s a few solutions out there that could help.