If both computers can access the Internet but fail the ping test, there is a final thing to look at: user isolation. On a home network, the success rate should be 100%. The ping command will give you an output that tells you how fast it was able to connect to the other computer as well as how many of the individual packets were returned successfully. This command will output various data about the IP address and state of the computer's network card. Start by opening up the command prompt on each computer and typing "ipconfig" for Windows users and "ifconfig" for Linux and Mac users. If everyone is connected to the same network, but you still can't connect, it could be due to a feature on your router called AP isolation. You can check to see if each player's computer can reach the computer hosting the game with a simple ping test. If any computers are connected to the router via ethernet, ensure they're connected to the same router that the others are connected to over Wi-Fi. player 1 isn't on "Wireless" and player 3 is on "Wireless_Guest"). Double-check that all computers are on the same local network with the same name (e.g. With Wi-Fi devices, especially laptops, it's always possible that the device is connected to a nearby open Wi-Fi network or a neighbor's Wi-Fi you've used before. We've set the article up with the individual sections labeled based on the specific things the people who need your troubleshooting help might say, like "I can't see the Minecraft game on the LAN," or "I can connect, but I get kicked out."Įnsure that all computers are on the same network. When your child (or friend) comes to you with one of these questions, you should be able to find the answers right here. With that in mind, we've written this guide emphasizing helping the layperson, who is often a parent trying to understand Minecraft and help their child, quickly identify what they need to do to alleviate their specific problem. Thanks to its popularity and the number of parents wrestling with it for their kids, we get more emails about Minecraft than any other game, by a wide margin. How to Identify Your Minecraft LAN Problem Let's take a look at how to identify and iron out issues with Minecraft LAN play. Please note that usually neither the exit code, nor its description are enough to diagnose issues!Īlways upload the entire log and not just the exit code.Minecraft is a fantastic game to play on your local network with friends, but it's no fun when you have to spend half your time troubleshooting connection problems. Process exited with code -1 (0xffffffffffffffff). : class $AppClassLoader cannot be cast to class ($AppClassLoader and are in module java.base of loader 'bootstrap')Īt .FMLRelauncher.(FMLRelauncher.java:60)Īt .FMLRelauncher.instance(FMLRelauncher.java:52)Īt .FMLRelauncher.appletEntry(FMLRelauncher.java:229)Īt .init(MinecraftApplet.java:25)Īt (Launcher.java:109)Īt (LegacyFrame.java:130)Īt .legacyLaunch(OneSixLauncher.java:142)Īt .launch(OneSixLauncher.java:254)Īt (EntryPoint.java:143)Īt (EntryPoint.java:34)įailed to invoke the Minecraft main class:Īt .FMLRelauncher.handleClientRelaunch(FMLRelauncher.java:38)Īt .main(Minecraft.java:2237)Īt java.base/.invoke0(Native Method)Īt java.base/.invoke(NativeMethodAccessorImpl.java:77)Īt java.base/.invoke(DelegatingMethodAccessorImpl.java:43)Īt java.base/.invoke(Method.java:568)Īt .legacyLaunch(OneSixLauncher.java:159) Java is version 17.0.5, using 64-bit architecture, from Oracle Corporation.Ĭ:/Users/zizzl/Documents/MultiMC/instances/1.5.2/nativesĬ:/Users/zizzl/Documents/MultiMC/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jarĬ:/Users/zizzl/Documents/MultiMC/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jarĬ:/Users/zizzl/Documents/MultiMC/libraries/org/lwjgl/lwjgl/lwjgl/2.9.4-nightly-20150209/lwjgl-2.9.4-nightly-20150209.jarĬ:/Users/zizzl/Documents/MultiMC/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.4-nightly-20150209/lwjgl_util-2.9.4-nightly-20150209.jarĬ:/Users/zizzl/Documents/MultiMC/instances/1.5.2/.minecraft/bin/minecraft.jarĬ:/Users/zizzl/Documents/MultiMC/libraries/net/java/jinput/jinput-platform/2.0.5/jinput-platform-2.0.5-natives-windows.jarĬ:/Users/zizzl/Documents/MultiMC/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.4-nightly-20150209/lwjgl-platform-2.9.4-nightly-20150209-natives-windows.jar Game refuses to open every time I click launch and displays a big fat wall of red text.Ĭ:/Users/zizzl/Documents/MultiMC/instances/1.5.2/.minecraftĬ:/Program Files/Java/jdk-17.0.5/bin/javaw.exe I make an instance in 1.5.2, I install Forge through MMC, and it just breaks.
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