However, many players have recently received a stressful error message: Internal Exception: java.io.ioexception. When you get the notification “an existing connection was forcibly closed by the remote host Minecraft,” you won’t be able to continue playing.  So what exactly does the java.io.ioexception error mean? The main reason you received this error is an internet connection error. There are several possible causes of connection failure, such as firewall blocking, router and issues, or outdated Minecraft or Java. While fixing the internal exception error in Minecraft might seem too technical, the problem can easily be resolved with the help of our step-by-step guide. If a standard power cycle or re-installing Minecraft or Java doesn’t work, set up your DNS, IP address, and server settings. In this article, we’ll begin by giving you an introduction to this common error. From there, go through our list of tried-and-tested troubleshooting solutions.  

What is  Minecraft Internal Exception Java io ioexception?

When you receive “Minecraft Internal Exception: java.io.ioexception an existing connection was forcibly closed,” this means that there was a problem with your internet connection. This network issue likely prevented your device from connecting with the Minecraft server.

1 What is  Minecraft Internal Exception Java io ioexception?1.1 What causes the error?2 How to fix Minecraft internal exception java.io.ioexception2.1 Check your Internet Connection2.2 Powercycle your system2.3 Update Minecraft2.4 Uninstall and Reinstall Minecraft2.5 Update/Fix Java2.6 Reset the Server2.7 Flush DNS and Renew IP address2.8 Change Router DNS to Google DNS servers2.9 Disable Server’s Resource Pack2.10 Turn off Firewall Permissions2.11 Enable Java Native Sandbox3 Conclusion

Getting this error can be very frustrating because you won’t be able to continue playing.  On top of that, it’s difficult to find the main cause of the problem. Any disruption in your network can cause a Minecraft server error. This means that you’ll have to try multiple solutions to try and fix the error.  

What causes the error?

As mentioned, there are many possible reasons why you received the connection error. It’s hard to pinpoint the exact point where the connection failed, but these are some of the most common causes:

Firewall permissions blocked access to the Minecraft server Incorrect DNS, IP address, or router settings Incompatible or outdated Minecraft and Java softwares

 

How to fix Minecraft internal exception java.io.ioexception

As mentioned, the Minecraft internal exception error is a bit complicated because there are many possible causes of the glitch.  To help you out, we provided 11 solutions on how to fix the java.io.ioexception issue.  Before proceeding, make sure that you have a stable internet connection. Try not to use mobile data or a mobile hotspot as these are much more unstable compared to a WiFi network. Make sure to try which solution works for you, and don’t skip any steps.  However, if none of these work, you may need to contact your internet service provider (ISP).  

Check your Internet Connection

Before trying anything complicated, make sure that your internet connection is stable.  Unreliable internet connection using mobile data or mobile hotspot can prevent your PC from connecting to the Minecraft server. Standard multiplayer mode will use 40MB of data per hour. Open an internet speed checker, and check if your bandwidth is up to par. The host computer should have at least 1.5 Mbps bandwidth. The appropriate bandwidth speed will depend on how many other gamers you’re playing with in Multiplayer mode. Ideally, though, bandwidth should be at least 100Mb an hour per user.   

Powercycle your system

The first thing you should try is restarting your PC, internet connection, and Minecraft.  For many users, simply doing a full power cycle fixes the issue. This is because it restarts the services and closes all failed processes. If this doesn’t work, try connecting to the internet using a different device, such as your smartphone. If you can’t connect to the network, the problem might be with your ISP.  Call your ISP so they can find the issue with your network setup.   

Update Minecraft

This is another effective solution that fixes the Minecraft internal exception error for most users. Updating Minecraft will do two things: it will remove the glitch in the installed program, and it will match your client application to the Minecraft server you’re connecting to. If your current Minecraft version doesn’t match your server, you will likely encounter some sort of connection error. Here’s another way to update Minecraft: If there’s a problem with updating Minecraft, you need to uninstall the game, then reinstall it again.  

Uninstall and Reinstall Minecraft

You need to re-download Minecraft if the available update in your area fails. Here’s how to uninstall and reinstall the latest version of Minecraft: Reinstall Minecraft on Windows: Reinstall Minecraft on macOS: Reinstalling Minecraft is also a recommended fix for jna-4.4.0.jar Error (the File Contents Differ From What Was Expected).

Update/Fix Java

For Minecraft to work, your Java software should be up to date.  There are some cases when updating Java doesn’t work. You’ll need to reinstall Java:  

Reset the Server

If you receive a connection error and restarting your PC or internet connection doesn’t work, you may need to reset the Minecraft Server. If you’re using someone else’s server, the only way to configure the server is to request the owner to reset it. If you own the server, you can use programs like Shockbyte, CraftyControl, or Multicraft.  

Flush DNS and Renew IP address

If your DNS or IP address is corrupted, you can flush DNS and renew your IP address.

Launch Command Prompt from the Start menu. Type these commands: 

ipconfig /flushdns ipconfig /release ipconfig /renew

Restart your computer, than launch Minecraft. Check to see if the error persists.

 

Change Router DNS to Google DNS servers

In cases where it’s difficult to get a stable internet connection, your ISP may have temporary issues that prevent your computer from connecting with the server. To fix this issue, you need to adjust your DNS settings in your router control panel. Primary DNS Server: 8.8.8.8 Secondary DNS Server: 8.8.4.4 While this strategy may not work all the time, connecting to Google DNS servers usually works better than the settings given by your ISP.  

Disable Server’s Resource Pack

Resource Packs allow users to add more personality into their gameplay. You can customize textures, music, and other skins onto Minecraft. However, if you have Resource Pack enabled, there are times when you will be blocked from the server. In this case, you need to adjust Resource Pack permissions:  

Turn off Firewall Permissions

Another common reason why Minecraft players get the connection error is because their PC fails to connect to the server because of Windows Firewall permissions:  

Enable Java Native Sandbox

Java Native Sandbox allows users to access Java applications in a restricted environment. This means that you can play Minecraft while bypassing connection issues to the server.  

Conclusion

The Minecraft Internal Exception Java.io.ioexception is caused by failed connections between your PC and the Minecraft server. This error is more complicated compared to other Minecraft connection errors because there are a lot of possible causes of the issue.  Before troubleshooting your PC, the first thing that you should do is check that you have stable internet connection. After confirming a strong connection, you can try powercycling your router and PC, updating or reinstalling Minecraft. If these don’t work, try to fix your internet connection by changing your DNS, router settings, or IP address. You can also try turning off Firewall permissions and disabling server resource pack. Other gamers solved the issue by enabling Java Native Sandbox. If these solutions don’t work for you, try contacting your ISP.