My sister got Minecraft yesterday and we're unable to join each others' LAN servers. We're on the same Wi-Fi router, neither of us have firewalls blocking Java and have updated to the most recent version, we're both on the same version of Minecraft, etc. The other troubleshooting articles/questions I've seen are aimed at Windows users-- both of us are on OS X El Capitan. Thank you in advance for your help!
Assuming you've done the normal troubleshooting (such as disabling the Firewall), you're experiencing bug with the networking protocol being used on MacOS (IPv6 versus IPv4), documented in detail here:
- ... also
MC-98499, MC-98772, MC-99283, MC-99419, MC-99884
The fix is to tell Java to prefer IPv4. This is not trivial as it requires forcing a
_JAVA_OPTION override at launch (or system wide).
To diagnose this as the cause, first launch Minecraft from terminal with the
- Close Minecraft
- Open 🔎 Spotlight (🔎 in upper right of Desktop)
- Search for "Terminal", open the app
Paste the following command in:
Attempt to connect to LAN server and see if it fixes the problem
Using Minecraft Launch Options: @TheOnlyMrCat provides a method here that does not involve editing any files by hand. Please try that before making changes to the Minecraft launcher.
Patching the launcher manually:
Use this method only if you have problems using @TheOnlyMrCat's solution.
_JAVA_OPTIONS override can be provided in many locations but since launching from Terminal is not ideal, we need to use a technique that fixes when clicking on the icon. At time of posting, the Apple recommended method for providing overrides is inside the App bundle itself using something called
- Optionally install a Text Editor such as Atom to edit XML files.
- Using Finder, go to Applications
- Locate (don't open) the Minecraft App
- Right click Minecraft, Show Package Contents
- Go into the
Contentsfolder and locate
- Right click
Info.plist, Open With, Atom (or TextEditor)
Near the bottom of the file, add the following in between the
</dict> </plist> <key>NSHighResolutionCapable</key> <string>YES</string> <!-- ######## ADD ONLY CONTENT BELOW THIS LINE ######## --> <key>LSEnvironment</key> <dict> <key>_JAVA_OPTIONS</key> <string>-Djava.net.preferIPv4Stack=true</string> </dict> <!-- ######## ADD ONLY CONTENT ABOVE THIS LINE ######## --> </dict> </plist>
Unfortunately this does not take effect right away. This is due to the way Mac caches it's launch services. Force refresh of the launch services using the following command from Terminal:
cd /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/ ./lsregister -kill -r -domain local -domain system -domain user
(Note, the path of
lsregistermay be different, you can find it using
find /System -name lsregister)
Launch Minecraft from the icon and search for LAN games to confirm that the fix was properly applied.
In the launcher, go into launch options and create a new profile.
Call it whatever you want and enable JVM Arguments. In the text box that highlights type in the following text at the end:
Mac is simply using iPv6 instead of iPv4 to try to connect to LAN worlds. The above text fixes that and forces it to use iPv4 when avaliable
I've noticed that Mac OS doesn't properly detect LAN worlds. The solution is to find the IP Address of the host, and then use the use Direct Connect to connect to the server.
To find your IP address on Mac, go to the Apple Logo Thing > About, and in that window that pops up there will be a link at the bottom. Click on it and it will open the System Profiler, and then in the Network tab it will show you your IP address. Then type that address into Direct Connect on the other laptop, and you've got yourself a friend XD
Whups, forgot something. When you open the LAN world, it will say something in chat like "Hosted LAN world on port 12345"
You have to type this port number in Direct Connect for this to work. Example:
On the Mac you want to host the computer his Esc and then select Open to LAN
Then on the Mac you will be joining the game select Multiplayer from the main menu and you will see the game which you can then join.
If you've done these steps and are getting an error when trying to join the game please edit that error into your question.
You both may need to download a program called LogMeIn Hamachi which is free and will allow you to connect.
Since you guys are using the same IP address, it won't let you connect. Without Hamachi, you can't connect from long distances; LAN stands for local area network.
With both of you using Hamachi, you can play. Its what I use. Look up instructions on how to use Hamachi, if you get confused.
protected by Community♦ Jul 31 '17 at 2:54
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