Minecraft Internal Server Error: How To Fix The "Failed To Connect To Server" Issue

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Playing Minecraft is a great way to unwind, so being met with a Minecraft internal server error is frustrating, as it thwarts players from accessing their worlds, and continuing their building projects. But rather than find yourself stuck, you've done the smart thing, and gone online to find solutions. And that's why we're here.

In this article, we'll explain the most effective ways to resolve the internal server issue on Minecraft. As you'll find out, the name of the error is a little misleading. Here's what you need to know.

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How To Fix The Minecraft Internal Server Error

There are four widely used methods for fixing this particular problem. Usually, if there is a server-related issue, there isn't a whole lot you can do about it, other than wait for a fix. However, as we alluded to earlier, while it is described as an internal server error, usually the issue isn't linked to servers at all. This is good news, because it means you actually have the chance to remedy it yourself.

Read More: Minecraft Outdated Server: How To Fix The Minecraft Outdated Server Error

Before you try any of these fixes, we'd recommend that you are signed in as an administrator on your computer. And double-check that you don't have any internet connectivity problems. Run through the usual checks - run a speed test, close any other apps or devices that are competing for bandwidth, restart your router, and try switching from WiFi to an Ethernet connection, if possible.

Assuming you've done all this, you're ready to try the following solutions.

Make Sure Minecraft is Fully Updated

If you are using an outdated version of Minecraft, the servers may not recognise it anymore. As a result, the servers will automatically block you if you try to join. It's important to check that you have updated Minecraft to the latest version of the game.

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Delete UUID Folders in Minecraft

One way of fixing this error is by resolving an issue with your Minecraft user profile. But in order to do this, you need to remove your UUID. A UUID is a universally unique identifier - a 128-bit code which identifies you as a user. If this is behind the error, then deleting this data from the server will resolve it.

  • You can obtain your UUID by visiting this website and entering some details.
  • Once you have this information, log into the server that is giving you this error. From here, go to Server Files and navigate to the world you want to access.
  • Select Players, then delete the username and UUID for whoever is experiencing the internal server error.
  • Once this is done, restart your computer, and try connecting once more.

Look at Your Mods

While mods are a major part of playing Minecraft and add to the experience, they can sometimes be responsible for causing errors. If our first fix didn't work, then it's well worth checking any mods that you have. Look to see if any of them have a version mismatch with Minecraft. If they do, then disable or delete the mod, and see if this makes a difference.

Mod developers will usually tell you which Minecraft version they are compatible with, so you can identify which ones may not work. If you have a lot of mods, try disabling them all, then enable them one at a time, to see which ones may be causing this error.

Minecraft internal server error
Credit: Mojang
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Check Your Plugins

Much like mods, plugins are a popular way to augment the base-Minecraft experience. But as with mods, they can also cause compatibility problems with the game. It's well worth repeating the mod fix for any plugins you may have installed.

Start by disabling them all, and then enable them individually and see if any are causing the problem. You can also see which version of the plugin you are using by typing '/version' inside the plugin window. If the version is out of date, you can try updating it and see if this helps.

If All Else Fails

A final fix if none of our previous suggestions has worked, is to try a complete reinstallation of Minecraft. This will often work if your installation files have become corrupted, or some other issue with them has manifested itself.

Make sure you've backed up your profile data, and any mods that you want to keep, then complete the following steps:

  • Press Windows + R, type appwiz.cpl in the dialogue box and press Enter.
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  • Find Minecraft in the application manager, right-click on it and select Uninstall. Alternatively, you can uninstall Minecraft by executing the uninstaller from the folder directory. Remember to delete all the mod files and temporary setting files as well.
  • Finally, download the game again. This will give you the most up-to-date version of the game, and hopefully resolve the Minecraft internal server error.

If even this doesn't work, then we recommend contacting Mojang Customer Support for further advice.

What Causes The Minecraft Internal Server Error?

As you'll have seen, the majority of the time this has very little to do with the servers themselves, and is much more commonly linked to problems with your specific setup. The most common causes are as follows:

  • An incompatible version of Minecraft, which needs to be updated.
  • A corrupted installation file.
  • Incompatible mod packs or plugins.
  • Corrupted temporary files that prevent Minecraft from running properly

Read More: Minecraft Multiplayer Not Working: How To Fix Minecraft Multiplayer

whatever the underlying reason for the issue in your case, trying the solutions we've outlined above will work in the vast majority of cases. And you can get back to building again.