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  1. Minecraft: Java Edition
  2. MC-101244

Can't scan for LAN worlds on macOS


    • Icon: Bug Bug
    • Resolution: Fixed
    • 21w19a
    • Minecraft 1.9.2, Minecraft 1.9.4, Minecraft 1.11, Minecraft 1.12.1 Pre-Release 1, Minecraft 1.13.1, 1.15.2, 1.16.1, 1.16.2 Pre-release 1, 1.16.2 Pre-release 2, 1.16.2 Release Candidate 1, 1.16.2 Release Candidate 2, 1.16.2, 1.16.3 Release Candidate 1, 1.16.3, 1.16.4 Pre-release 1, 1.16.4 Pre-release 2, 1.16.4, 20w45a, 20w49a, 20w51a, 21w05b, 21w07a, 21w08b, 21w16a
    • macOS Catalina 10.15.7
    • Community Consensus
    • Networking
    • Important

      For whatever reason, Minecraft on macOS can't scan for LAN worlds because of an error: "Unable to start LAN server detection"

       [18:13:53] [Render thread/INFO]: Environment: authHost='https://authserver.mojang.com', accountsHost='https://api.mojang.com', sessionHost='https://sessionserver.mojang.com', servicesHost='https://api.minecraftservices.com', name='PROD'
      [18:13:54] [Render thread/INFO]: Setting user: CatObsession
      [18:13:55] [Render thread/INFO]: Backend library: LWJGL version 3.2.1 build 12
      [18:14:00] [Render thread/INFO]: Reloading ResourceManager: Default
      [18:14:16] [Render thread/INFO]: OpenAL initialized.
      [18:14:16] [Render thread/INFO]: Sound engine started
      [18:14:18] [Render thread/INFO]: Created: 1024x1024x4 minecraft:textures/atlas/blocks.png-atlas
      [18:14:18] [Render thread/INFO]: Created: 256x128x4 minecraft:textures/atlas/signs.png-atlas
      [18:14:18] [Render thread/INFO]: Created: 1024x512x4 minecraft:textures/atlas/banner_patterns.png-atlas
      [18:14:18] [Render thread/INFO]: Created: 1024x512x4 minecraft:textures/atlas/shield_patterns.png-atlas
      [18:14:18] [Render thread/INFO]: Created: 256x256x4 minecraft:textures/atlas/chest.png-atlas
      [18:14:18] [Render thread/INFO]: Created: 512x256x4 minecraft:textures/atlas/beds.png-atlas
      [18:14:18] [Render thread/INFO]: Created: 512x256x4 minecraft:textures/atlas/shulker_boxes.png-atlas
      [18:14:22] [Render thread/INFO]: Created: 256x256x0 minecraft:textures/atlas/particles.png-atlas
      [18:14:22] [Render thread/INFO]: Created: 256x256x0 minecraft:textures/atlas/paintings.png-atlas
      [18:14:22] [Render thread/INFO]: Created: 256x128x0 minecraft:textures/atlas/mob_effects.png-atlas
      [18:14:34] [Render thread/WARN]: Unable to start LAN server detection: Can't assign requested address
      [18:20:31] [Render thread/INFO]: Stopping!

      Find your internal IP address (Windows, macOS) on the computer hosting the world, then on the other computer(s) go to the Multiplayer screen in Minecraft and click Direct Connect. Then on the hosts computer start the LAN world and take note of the message that says "LAN world hosted on Port xxxx". Then, on the other computer, in the Direct Connect field, put the internal IP address of the host computer followed by a colon ( : ) and then the number in the "LAN World hosted on Port xxxx" so for example You should now be able to connect.

            Unassigned Unassigned
            AppleAuthority Southpaw1496
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