How To Fix Internal Exception Io.netty.handler.codec.decoderexception

While Minecraft isn't one of the most graphically intensive games, information technology can even so cause problems for players; especially those trying to play Minecraft multiplayer on Minecraft servers.

For those facing the error with Internal Exception while trying to connect to a Minecraft server, it can be challenging to fix it. This can be due to several different reasons.

This guide will dive into the all-time ways players tin hopefully fix the Internal Exception error when trying to play the game.

How practice you prepare the Minecraft Internal Exception (io.netty.handler) (Java.IO.IOException) errors?

Just put, a connection problem causes this error. This could exist due to several things. Players can endeavour each of the standard solutions listed below to run across if one happens to rectify the issue.

First, check if the server you are trying to join has an error

Players should offset bank check whether the connection issue causing the Internal Exception error bulletin is coming from the server or their side.

If the error is from the server-side, players can rest assured that nothing is wrong with their copy of Minecraft or their PC settings. It is simply a problem with the server itself.

The all-time way to check if the server has an fault is by connecting to this testing server with IP: exam.prisonfun.com

If the connection to this server is successful, there is no problem with the game client or PC settings. This particular server supports all versions of Minecraft and is always up to date, and then it is the best place to test any potential connectedness problems.

If the connection to this server is unsuccessful, then there is an outcome on the player's side, not the server. Players can try the proposed solutions below to try and fix them.

Update Java

Minecraft is a Java application and needs Java to run. Players should ensure they have the latest official Java version:

Become to the official Coffee Download establish here
Download the latest version of Java available
Complete the installation
Retry on Minecraft to join server IP: exam.prisonfun.com

Turn off Firewall + Antivirus + VPN

Minecraft multiplayer is sensitive to specific Firewall rules, Antivirus settings and VPNs.

Players can try and disable all 3 of these and retry the connection:

Plow off firewall

Press Windows Key + R (or type "run" in the starting time menu)
Blazon "control" in the Run menu and hitting enter
Press "Arrangement and Security"
Press "Windows Firewall"
On the left-hand side, press "Turn windows defender firewall on or off"
Plow off the firewall for both public and private network
Retry on MC to join server IP: test.prisonfun.com

Turning off the antivirus and VPN is less straightforward than turning off the firewall. It volition depend on the specific antivirus and VPN being used.

Plow off AntiVirus

If players are using a specific type of antiviruses such as Norton, McAffee, or Avast, they must be fully disabled in their control panels. After doing this, players can retry to connect to the server IP: examination.prisonfun.com

Turn off VPN

If players are connected to any VPN, information technology should be turned off and disconnected. After doing this, players can retry their connection to the server IP: test.prisonfun.com

Change DNS Server Accost

The DNS server can take an impact on failed connections. It is important to make sure information technology is up to date and accurate.

Press Windows Central + R (or type "run" in the start bill of fare)
Type "control" in the Run menu and hit enter
Navigate to the "Network and internet" tab
Press "Network and sharing center"
Select the connection (usually either "Ethernet" or "wifi")
Printing "Properties"
Click "Cyberspace Protocol Version 4" (IPv4)
Select "Apply the following DNS server addresses"
For the primary DNS server, apply eight.8.8.8
For an alternate DNS server, use eight.8.iv.4
Printing "OK"
Retry on Minecraft to join server IP: examination.prisonfun.com

Users may want to scout this video beneath on how to change the DNS server (it works for Windows 10 and xi).

Re-download a fresh Installation of Minecraft

There may be something incorrect with the Minecraft installation. Players should endeavour to re-download a fresh copy with no modifications enabled.

Open the official Minecraft launcher (download it here if you don't have it)
On the primary launcher menu, click the "Installations" button (it should be at the tiptop of the screen on the navbar)
Press "New installation"
Select the version of Minecraft you lot want to use (Latest release is recommended)
Press the green "Create" button on the bottom right of the installation menu
Make sure the newly created version is selected on the master launcher menu
Hit the large green "Play" button on the main launcher card
Retry on Minecraft to join server IP: examination.prisonfun.com

Install Minecraft to a new directory

If re-downloading a fresh installation of Minecraft is unsuccessful, players can try and install a new Minecraft directory birthday.

Open the official Minecraft launcher (download it here if you don't have it)
On the master launcher menu, click the "Installations" button (it should be at the top of the screen on the navbar)
Press "New installation"
Select the version of the game you lot want to use (Latest release is recommended)
For the "Game Directory" selection, printing "Scan" and select whatever place where yous desire to install the game on your PC if you don't know where just press "Desktop" at the acme.
Hitting OK
Press the green "Create" button on the bottom right to create the new installation contour
Make sure the newly created installation profile is selected on the main launcher menu before launching the game
Hit the big green "Play" button on the main launcher menu
Retry on MC to join server IP: exam.prisonfun.com

Endeavor VPN or a different wifi network

If nothing has worked so far, in that location might exist an issue with the local network. Players can confirm if this is the instance by connecting to a different wifi network or simply via a free VPN downloaded online.

Players are free to use their VPN, or they can effort out the one in the video tutorial below.

After a VPN is connected to it, players can once over again try and connect to the exam server IP: test.prisonfun.com

Enable Java Native Sandbox

Enabling the Java Native Sandbox option has helped some users clear upward their issues related to io.netty.handler and Java.IO.IOException.

Press the Windows key (or click the first bill of fare icon)
Type Configure Java and press enter
Navigate to the "Advanced" tab and scroll down to the "Advanced security settings" and enable the option "enable the operating system'due south restricted environs (native sandbox)."
Printing Apply, and so press OK
Reboot the PC. This is very important.
Retry on Minecraft to join server IP: test.prisonfun.com

Restart Router

Sometimes, the connexion trouble tin can originate from the local router needing a reboot. This is for various technical reasons, but restarting a router can assign a new IP and much more, which tin help fix the underlying problem.

Unplug the network router
Wait a few minutes (restart your reckoner during this time)
Plugin the network router
Retry on MC to bring together server IP: examination.prisonfun.com

Ensure in that location are no parental or admin restrictions on the PC/Network

Another major crusade of the io.netty.handler and Java.IO.IOException problems is due to restrictions that are applied by parental command software (e.g., NetNanny, Norton Family, Qustodio, etc...) and network administrators.

Unfortunately, the simply mode to fix this is to plow them off entirely, which varies in each case due to different software being used.

Should players be aware that parental or admin restrictions are practical to the auto or network, these could most certainly be the underlying crusade of the problems.

Once these restrictions are fully turned off, players can once once more attempt and connect to the server with IP: test.prisonfun.com

For detailed guides, walkthroughs, tips & more, bank check out SK Minecraft Wiki

Edited by Srijan Sen

Source: https://www.sportskeeda.com/minecraft/how-fix-internal-exception-error-minecraft-io-netty-handler-java-io-ioexception