Connectivity Problem with Minecraft - I can Connect but friends can not

System Information

Field Value
Operating System Linux - Ubuntu 24.04.3 on x86_64
Product AMP ‘Phobos’ v2.6.3.2 (Mainline)
Virtualization None
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Ready

Problem Description

Issue

i can join the server just fine, but my friends get the error failed to connect do to unknown host. our mods match and ive spent hours going into circles. modded minecraft providence 2

Reproduction Steps

  • friend enters ip
  • games loads for a moment
  • gives error failed to connect do to unknown host

Have you port forwarded the Minecraft server’s game port?