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Help With Minecraft LAN Server On Mac?
This isn't trivial because it requires forcing a _JAVA_Possibility override at launch (or system broad).
Diagnose
To diagnose this as the trigger, first launch Minecraft from terminal with the _JAVA_Choices overridden.
1. Shut Minecraft
2. Open 
Highlight ( in upper proper of Desktop)
3. Search for "Terminal", open the app
Paste the following command in:
_JAVA_Choices=-Djava.web.preferIPv4Stack=true /Purposes/Minecraft.app/Contents/MacOS/launcher
Attempt to hook up with LAN server and see if it fixes the issue
Completely Fix
Using Minecraft Launch Options: @TheOnlyMrCat supplies a way here that doesn't contain editing any files by hand. Please strive that before making modifications to the Minecraft launcher.
Patching the launcher manually:
Use this method solely if in case you have problems utilizing @TheOnlyMrCat's resolution.
This _JAVA_Options override will be offered in many areas but since launching from Terminal is just not splendid, we'd like to make use of a way that fixes when clicking on the icon. At time of posting, the Apple really helpful technique for offering overrides is contained in the App bundle itself utilizing one thing referred to as LSEnvironment
1. Optionally set up a Textual content Editor corresponding to Atom to edit XML files.
2. Utilizing Finder, go to Applications
3. Find (don't open) the Minecraft App
4. here we go again Proper click Minecraft, Present Package Contents
5. Go into the Contents folder and locate Information.plist
6. Proper click on Data.plist, Open With, Atom (or TextEditor)
Close to the underside of the file, add the following in between the LSEnvironment _JAVA_Options -Djava.net.preferIPv4Stack=true
Sadly this does not take impact right away. This is because of the best way Mac caches it is launch services.
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