12 Fixes For Minecraft Multiplayer Internal Exception Java.io.ioException Error

So, you wanted to enjoy your Minecraft game. But now, you’ve run into an error code. It is none other than the infamous internal exception Java.io.ioexception error. Now, it is getting annoying as you try to enjoy the game online. So, what do you do?

Player in Minecraft Hardcore world

First, you need to learn what this error means. Once you have an idea about it, you can understand the reason for this error. Finally, you will get to fixing this error.

If anything remains, there are some questions answered to help you out. So, make sure to check this out because you are going to get all the solutions in this article:

Why Does It Mean When Minecraft Says Internal Exception java.io.ioexception?

If you don’t want to butter it, the error is related to the connection error. More specifically, it is the internet connection error to the server. Whenever you try to connect to a Minecraft Server, you might receive this error.

Now, it is okay if you get it for one or two servers. It could be a problem from the server’s end, but it is time to pay attention if the error rates increase. It means that the problem is from your end.

Typically, your connection will get interrupted, and you won’t have enjoyable gameplay. Ergo, the app has decided to end the connection.

How To Solve Internal Exception: java.io.ioexception In Minecraft?

Before you try anything drastic or advanced, try some standard solutions. These basic fixes can help you avoid a lot of trouble.

  • First, try to restart the Minecraft game. Close it thoroughly and then relaunch it via the launcher or any medium that you use.
  • Second, try to restart your system. Maybe the problem is on your system end.
  • If you still haven’t had any luck, try to reconnect the connection. Restart the router by plugging the power out and then replugging it. See it restarting the router fixes the problem. If you use a LAN cable, reconnect it and see if that works.
  • Sometimes, having a longer username (above seven characters) poses a problem for the players. Try to use a shorter username to access the server.
  • Make sure to log out of and restart Minechat, as well. It can sometimes interrupt the connections.
  • Don’t forget to take note of your internet speed—double-check to make sure that you match the required speed for the Minecraft server.
  • Also, check if the server is available for you to join or if it is running into problems.

Solutions For Minecraft Multiplayer Internal Exception

  1. Reinstall The Minecraft
  2. The Java Native Sandbox Method
  3. Change The DNS Of Your Router Connection
  4. Clear The DNS Cache 
  5. Update The Minecraft Launcher
  6. Try Disabling The Server Resource Pack
  7. Try Decreasing The Render Distance
  8. Update Or Install Java
  9. Try The Java Path Method
  10. Try Some Network-Related Solutions
  11. Change The Firewall Settings
  12. A Clean Boot Reboot

Fix The Minecraft Exception Java Error

1. Reinstall The Minecraft

Remember that before you get in-depth into the solutions, it is wise to reinstall Minecraft. The error could be due to corrupted files of the game. Often, a lot of errors in Minecraft are due to file problems.

So, all you have to do is uninstall Minecraft, along with its launcher, from your system. Then, make sure that you have the latest version and reinstall it.

When you do so, there’s no need to uninstall mods and texture packs. There’s no need to uninstall Optifine. You can do that if this doesn’t solve the issue. Also, make sure that you only have the mods and texture packs that the server allows.

Follow these steps: 

  • Go to the Windows Search Bar (at the bottom), find Control Panel, and then open it.
  • Go to Programs and select Uninstall A Program.
  • After that, find Minecraft on the list. Right-click on it and select Repair if it shows the option to.
  • Follow through with the entire process and then restart the PC.
  • If this works, then great. If not, then Uninstall Minecraft & Java, both.
  • For this, right-click on them and select Uninstall/Remove one after another.
  • After that, press the Windows + R key and type %AppData%
  • This should open a folder for you. If it doesn’t, then manually use the File Explorer to navigate to the folder.
  • Find the Local, LocalLow, & Roaming directories. In each one, find Minecraft folders and delete them.
  • Once you’re done, restart the PC.
  • Now, redownload Java and Minecraft This time, make sure to launch their setups as Admin.
  • To launch them as Admin, right-click on the setup files. Then, select ‘Run As Administrator.’ Allow permission when a prompt appears.
  • Now check and see if this solves the issue.

2. The Java Native Sandbox Method

The latest Windows 10 and Windows 11 OS could interfere with the javascript. There’s a built-in Java Native Sandbox in the latest Microsoft OS. These allow you to run Java applications without any restriction. If you have a restricted environment or settings for Java apps, this solution is worth giving a try:

  • Use the bottom search bar at the Task Bar to type ‘Control Panel.’ Click on it to launch it.
  • Now, go to the Programs option and find the Java listed there. It should be available for 32 bit systems. If you can’t find the Java Native Sandbox option, it might not be supported in your Windows platform.
  • If you found it, then click on it to launch it. This will open the Java Control Panel. Now, go to the ‘Advanced’ tab.
  • Scroll down and find the ‘Advanced Security Settings’ option.
  • In this section, you will find a checkbox, ‘Enable The Operating System’s Restricted Environment (Native Sandbox).’ Make sure that it is checked on.
  • Then click on Apply and press OK.
  • Make sure to restart your PC after enabling the feature.

Once you restart, see if the connection is sustainable to the server. If not, then move to another solution.

3. Change The DNS Of Your Router Connection

DNS servers might seem almost irrelevant, but they play a vital role in the background. They are responsible for working with your ISP for a stable connection. If your internet service provider runs into a problem with a DNS server, you can get the Minecraft error.

There are two ways for you to fix this:

  • Go to the Admin controls of your Router. Once you log in there, you will find the DNS settings there.
  • Another option for you is to use the Network configuration. For this, keep following the steps.
  • Go to the Control Panel. Open it in any way possible for you.
  • Then find the Network And Internet option.
  • Now, right-click on your Wi-Fi, Ethernet, or Internet connection (currently active). Make sure you do it for the one you use to play Minecraft. If you use many connections, you will have to do it for each one individually. Do it whenever you connect with them.
  • Right-click on it and select Properties. Now, go to the Networking tab.
  • There, you will see Internet Protocol Version 4 (TCP/IPv4) among the list of services. Right-click on it and select Properties.
  • Now, you just have to click on ‘Use The Following DNS Server Address’ to enable it. And then change the preferred DNS And Alternative DNS.
  • You will have to change the Primary DNS Server to:
  • Change the secondary DNS server to:
  • Now click on Apply and OK to save changes.

This is an official Google DNS. The Google DNS is great for connecting with various gaming servers and playing. Many people find it highly reliable. So, you can give it a try, as well. See if this solves the issue. If not, then move ahead: 

4. Clear The DNS Cache

There’s another option if changing the DNS server doesn’t work. It means that the problem could be in your DNS cache. So, you can clear it out, and this can help you fix the problem. Usually, this will make your system get new combinations for your ISP automatically. So, it is worth the try:

  • Click on the Search Bar in the Task Bar of your Windows 10 PC. Now, search for Command Prompt. Right-click on it and select ‘Run As Administrator.’
  • Now, type these commands: ipconfig/flushdns
  • Press enter and type: ipconfig/release. Hit enter again.
  • Then type: ipconfig/renew
  • Now close the command prompt. This will flush and reset the DNS for you.

Now relaunch and reconnect. See if this solved the issue.

5. Update The Minecraft Launcher

There’s a possibility that your Minecraft launcher is outdated. Thus, it can result in an internal exception error. This can happen due to the incompatibility with the server’s version. Thus, it is a good idea to update the Minecraft launcher. Make sure to always keep it up to date to the latest release.

Before trying this step, make sure that you have only one account linked and activated on the launcher. If you have more than one, you can run into an error for no reason:

  • Double-click on Minecraft Launcher to run it. Then go to the Options.
  • Find the ‘Force Update ‘ option and click on ‘Apply The Launcher Update.’
  • This will scan and download every available update. The entire process is automatic. You just have to wait.
  • Once done, make sure to relaunch the launcher.

If this doesn’t work, you can try to use other launchers that are community-developed.

6. Try Disabling The Server Resource Pack

There’s no doubt that resource packs enhance the appeal of the game. They allow you to get new customizations for textures, music, models, and much more. But, some servers aren’t capable enough to handle it.

Others might just not allow them. This can lead to problems with communicating with the server. As a result, you will face the java.io.ioexception error.

So, try to disable the resource pack by following these steps:

  • Open the Minecraft Launcher.
  • Go to the Multiplayer option and find the server on the list. It should be the server that is causing the problem.
  • Now, there should be an edit option next to it. Click on it.
  • Now, find the Server Resource Packs option and Disable it. Then click Done.
  • Do this if the resource pack was enabled in the first place. If it wasn’t enabled, keep it that way.

Now relaunch the game and reconnect with the server. See if this solves the issue.

7. Try Decreasing The Render Distance

While connecting, Minecraft tries to render the video blocks on the server. If you have poor connection speed, there could be an internal exception error. You can try to reconnect.

But, if that doesn’t work, you can decrease the Render Distance. It is an option available in Minecraft settings that can help you fix the issue:

  • Once again, launch the Minecraft Launcher. Go to the Options.
  • Click on Video Settings and check the Render Distance Slider. See if you can slide it lower. If you can, good, but if not, then move to another solution.
  • Once you reduce the Render Distance, reconnect and see if that works for the game. Now, increase the Render Distance with one value and stop once it starts causing the problem.
  • Use the above-given resource pack guide to see if you can change the server’s Render Distance, as well. It will be worth the effort.

8. Update Or Install Java

Once again, this option will only work if you have Java installed on your PC. If there is no Java installed, you won’t find this solution effective. Most 32-bit systems have it. You can most likely download Java for PC as well.

  • Once you have Java, click on the Windows Search option. Type ‘Configure Java’ and see if it finds the settings for you. If it does, click on it to open it.
  • Now, go to the Update Tab and click on the Update Now option.

If you’ve recently downloaded Java, you might not need to update. But, it is still worth giving a try.

9. Try The Java Path Method

Maybe your Minecraft Launcher has a hard time finding the Java Path. This can happen for many unknown reasons. So, it is worth giving this step a try. This can solve the error: 

  • Open the File Explorer and go to the Program Files (x86) of your system.
  • Find the Java folder in the list. You can use the Search Bar in the top right corner. Then find the latest version of Java (there should be installation).
  • In there, you will find a Bin Folder. Go to the Address bar of the File Explorer and copy the entire address.
  • Now, launch the Minecraft Launcher and click on Edit Profile
  • Go to Java Settings (Advanced) and check on ‘Executable.’
  • After that, paste the full address that you’ve copied here.
  • Now, click on Apply and save the settings.

Now check if this solves the issue for you.

10. Try Some Network-Related Solutions

As mentioned earlier, the entire internal error is related to an internet connection. So, it would be wise for you to pay attention to a couple of pointers and solutions. Here is a compiled list that can help you out:

Try The VPN

There’s a possibility that your ISP just doesn’t support the Minecraft servers. There could be many reasons for this lack of connectivity. It could be a banned region, or you’re far away. So, you can try using a VPN.

VPN is a fantastic way to bypass the typical connectivity barriers. You can try and use different connections with the VPN. Of course, if you’re already using a VPN, try to disable it. Then, restart your internet connection.

On a side note, make sure to always use premium VPNs like Nord and ExpressVPN. Don’t try to use free or third-party VPNs that aren’t authentic or secure. They can mess with your system more than you’d think.

Disable Hardware Acceleration For Router

If you have some of the latest routers, it most likely has this feature of NAT Acceleration. Even older ones come with it. To disable it, you will have to find your Router’s Admin Control Page. You can find the guide on how to access it on the manufacturer’s website.

  • Open your internet browser and go to the Router’s Admin Control Page.
  • Find the LAN option and click on Disable Hardware Acceleration.
  • If you don’t have Hardware Acceleration, it could be NAT Acceleration, Cut-Through Forwarding, or Flow Acceleration. Different Routers use different names.
  • Once you disable it, save and apply the settings.
  • Now reconnect and see if this solves the issue for you.

11. Change The Firewall Settings

Windows Firewall has always been a remarkable security asset. There’s no doubt that it helps people a lot. But, the internal exception Minecraft error could pop due to the Firewall. It happens when Firewall is blocking the connection for Minecraft. It could be related to any component that Minecraft uses.

From Java to Minecraft Launcher, you would have to enable many components. But, before you do that, try to disable Firewall. Disabling the Firewall will give you an idea if it is indeed a problem from that end.

  • Go to the Search Bar and Type Firewall. It will show you ‘Firewall & network protection.’ Click on it to access it.
  • Now, the Firewall will show Domain Network, Private Network and Public Network. It will show you which networks have a Firewall on.
  • To disable them, click on them, and there will be a toggle switch. Do this for all three options.
  • Now, use the Minecraft Launcher and see if this solves the connectivity issues.
  • If it does, then return to Firewall Settings like before. Click on ‘Allow an App Through Windows Firewall.’
  • Now, find various apps like Java and Minecraft in the list. Allow them by clicking on Change Settings.
  • See if this fixes the issues.

12. A Clean Boot Reboot

If none of these worked, then this is an extensive option. It will consume time, but it will be worth it.

There comes a time when you might have too many apps, games, and other programs on the PC. As a result, these programs and apps can clash with each other.

They might try to overrun each other’s command and features. Inevitably, there could be an app causing the same problem to your Minecraft server. It could be due to a specific app hindering the connectivity. So, it is worth giving a try:

  • Launch Services and Windows Task Manager.
  • Disable all Startups in Task Manager.
  • Go to Services and click on ‘Hide Microsoft Programs’
  • After that, right-click and disable each service. Make sure not to do it for the Hardware services. The hardware services will have the name of the hardware manufacturer in them. Like Realtek, NVIDIA and so on.
  • Once you disable everything, reboot the PC.
  • Now enable each service and see if anyone explicitly causes the problem. For this, you will have to launch Minecraft and connect to the server each time. But, it is worth the risk.
  • Once you find the troublemaking program, uninstall it. Then you can go on your day and have fun.

Conclusion – Connection Suddenly Getting Java Exception In Minecraft

This wraps up the solutions for the Internal Exception Minecraft error. Now, if you ever run into this problem again, you can always use one of these methods. At least one of these solutions is bound to work for you. So, next time you get Minecraft Multiplayer Internal Exception while playing Realm or any other version, feel free to give these a try.

But, if you still run into the problem, it could be the hardware, the PC, or the OS. You can try resetting them and reinstalling the windows. That is a doubtful case because these solutions will certainly help you solve the Java error in Minecraft.

FAQS – Minecraft Internal Error On Computer Device Java Platform

What Is Internal Exception Java Lang Nullpointerexception Minecraft?

Using a different Minecraft launcher, you will run into an internal exception java lang nullpointerexception Minecraft error. It is the same as the java.io.ioexception internal exception Minecraft error. Thus, you don’t have to worry too much. Typically, signing out and in of the Launcher solves the issue. If that doesn’t do it, you can reinstall the Minecraft Launcher and see if it solves the problem.

What Is Minecraft Realms Diesieben Map?

Minecraft Realms is a multiplayer initiative from Microsoft. It comes with plenty of servers, maps and much more. If you get a Diesieben Map, it is a German Setting map. So, it would be better for you to stick to your servers. Diesieben servers and maps will cause more Minecraft exception errors for you. To solve it, use VPNs.

How To Fix Internal Exception Minecraft Java Error?

You can restart the Minecraft Launcher, your PC, and the router. It will solve 90% of the problem. But, if the problem persists, you can check firewall options to make sure that you connect to the server just fine. Using VPN or changing DNS for the users have also worked in solving the issue.

Do You Need Java To Fix Minecraft Exception Error?

There’s no need for you to download and install Java if you have the latest launcher. But, if you run into Internal Exception Minecraft error, give it a try. Installing Java can significantly help you eliminate these errors and problems. Make sure that you have an up-to-date Minecraft Launcher and Java.