I cant join a lan world working on both my friends computers

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...go to multiplayer
3. ...says "searching for lan worlds
4. ...no worlds show up