As stated in the title, we get the error Minecraft: java.net.connectexception whenever we try to connect to each other's LAN worlds. We have tried several fixes including:

  • Using Hamachi
  • Turning off our firewalls
  • Creating new inbound rules for Minecraft
  • Installing a different version of Minecraft

Nothing so far has worked. We can connect to other servers just fine, but can never join each other's LAN worlds.

Any suggestions or fixes, would be greatly appreciated.

Thank you in advance you wonderful person <3.

  • By rule you mean port?
    – Reflexive
    Feb 1, 2017 at 10:49
  • I know you mentioned that you messed with the firewall and firewall rules on your PC, but I would try these steps posted by Void Walker in the order they listed.
    – DrZoo
    Feb 1, 2017 at 15:37
  • Thank you for the advice, i tried all of these steps previously, none of them yielded results. Feb 1, 2017 at 19:36
  • Are you both on the same network? (ie. connected to the same router/switch)
    – Zymus
    Jul 21, 2017 at 19:16
  • @galacticninja Can you expand on how are they the same? This one seems to be having a problem with Java, whereas the suggested duplicate is a Minecraft server issue (it seems to my Minecraft-layman eyes).
    – Joachim
    Sep 8, 2019 at 8:40

2 Answers 2


I believe that this is probably a firewall problem. Have both of your computers have firewall disabled on both public and home networks? My sister and I tried this after going days without being able to play lan and it worked but if you do not wish to do this then here is a way to let programs through your firewall, not ports. And also realise that Minecraft now has built in Java so please post the executable path in the launcher's edit profile section. So to begin go to the start menu and paste this in:

Control Panel\System and Security\Windows Firewall\Allowed Programs

Then click change settings:

Allow Programs section

Then press allow another program...:

And then what you must do is paste what is in your executable which you found in the Minecraft launcher: Executable Location . And then click add. I hope this help's you

  • Thank you for the answer :), but i already tried doing that, it didn't have an effect and the problem persisted. I attempted doing it again, but it gave me a message saying that i already added that to the list of exceptions. Feb 1, 2017 at 19:24

My brother and I had the same problem. I couldn't connect to his server and we used the exact same programs.

Here's the solution: swap roles, have whoever is hosting at the moment try letting the other person try hosting instead.

We tried this, so now I'm hosting. Now, my brother and I can finally play together.

  • And please put your firewall backup!!! Jul 31, 2017 at 7:03

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