How to fix the io.netty.channel bug in Minecraft

Minecraft is a critically acclaimed sandbox survival game developed by Mojang Studios.
The game offers both single-player and multiplayer, with multiplayer being very popular.
An estimated 20 percent of players encounter a bug known as io.netty.channel that prevents them from connecting to cooperative play over a local network or the Internet.
This error can be caused by the wrong IP address or a port specified when trying to connect to the server.

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Table of Contents

Io Netty Channel Abstractchannel Annotatedconnectexception

The error io.netty.channel.AbstractChannel$AnnotatedConnectException can usually be fixed by simply resetting the router on your computer.

Minecraft is a sandbox game developed and published by Mojang. The game was released in 2011 and instantly became popular in the online gaming community. It has one of the largest player counts with a giant number of 91 million players logging in monthly. However, quite recently a lot of reports have been coming in of users encountering the error “io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information” while trying to connect to a server. This error is not limited to a single server and persists across all of them.

With over 120 million active users by 2020, Minecraft will be the best-selling game of all time. It has been well received by players over the years and is written in the Java programming language. Mojang Studios’ Minecraft is a critically acclaimed sandbox survival game. It was released in November 2011. It uses the Java programming language and is written in Java. With a circulation of about 200 million copies today, Minecraft is among the world’s best-selling games.

Minecraft Lan Connection Refused

The Minecraft LAN not working issue can be caused by not being connected to the same network as all other participants. Check that you and your fellow gamers are connected to the same network if you cannot join a LAN session.

In Minecraft, players can choose to play in a variety of ways. There is a single-player mode as well as a multiplayer mode, which is extremely popular. By doing so, players can achieve goals together and compete against each other.

Microsoft Windows, Mac OS, Linux, Xbox, PlayStation, and Android are the most popular platforms on which Minecraft can be played. Cross-platform play was added to the game in 2017. As well as texture packs, custom maps, and quality of life mods like minima and waypoints, this game offers a lot to its players.

Minecraft io.netty.channel.AbstractChannel$AnnotatedConnectException can also be triggered by a dynamic IP address on a web connection.

An estimated 20 percent of players face a problem called io.netty.channel, in which they cannot connect to any server, whether they are on a local network or online.

Connection Refused: No Further Information Minecraft Server

A firewall issue often leads to the io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information error. This can be resolved by bypassing the firewall completely.

It is possible for you to receive an error message like this one, depending on your version of Minecraft:

Timeout exception for io.netty.channel.ConnectTimeoutException
In this case, the connection has expired due to the Io.netty.channel.AbstractChannel$AnnotatedConnectException.
There is no more information to be provided for the channel annotation: IO.netty.channel.AnnotatedConnectReception: connection refused.

Despite the fact that the error text does not provide much information, it does indicate that the connection is broken. However, the basic issue is still the same, which is the inability to connect to the server. Various factors may cause this error, such as blocking Minecraft from connecting to the Internet with Windows Defender or third-party antivirus software.

What causes io.netty.channel error in Minecraft

Connection Refused No Further Information Minecraft Server

X.X.X.jar doesn’t allow traffic to C:/Users/user/AppData/Roaming.minecraft/versions/<version>. (This is the version you are trying to use) If your firewall is blocking that file, you will see this error message.

The problem was reported by many users and we investigated the problem and found several solutions that resolved the issue for most users. Below are the causes that caused the error.

IP problem: In some cases, the problem is caused by the wrong IP address or a port specified when trying to connect to the server. The correct IP address and port are used to send your connection to the server, and the connection is established as soon as the server approves it. Unless you use a static IP address, which is rare, the IP address assigned to you by your ISP will change from time to time, and multiple users may be assigned to the same IP address. Therefore, the IP address must be changed from time to time.
Firewall: It is also possible that the Windows firewall you are using is blocking your connection to the server. The Java files and the game directory must be added to the Windows firewall exception list in order for the game to properly connect to the server.
Outdated Java: Minecraft requires that the Java software be updated to the latest version in order for the game to work properly. If Java is outdated on your device and the launcher has been updated to the latest version, this may cause conflicts with some elements of the game and prevent you from properly connecting to the server.
Incompatible Software: There is a list of software that is not compatible with Minecraft and will cause problems when installed on the computer you are trying to connect to the server. Minecraft has an official list of software that is not compatible with the game and will cause conflicts.

To avoid conflict, try these solutions in the proper order after you have a good understanding of the problem.

Fix the io.netty.channel error in Minecraft

Updated: April 2024

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Reset router

A simple solution is to reset the router. The router should be powered up, then plugged back in and turned on after a while to fix the io.netty.channel error.

The reset button on your router can be held for 10-30 seconds to reset the router to factory settings. Some users report that this fixed the problem for them.

When you reset the router this way, all user settings are also wiped out. A paper clip is usually necessary to press the reset button.

Check firewall application permissions

The Windows Defender firewall often causes the io.netty.channel error. To resolve this, press Windows + S to open the Minecraft server’s ports.
You can then search for firewall in the text box by typing the term.
The Control Panel is accessible by clicking Windows DefenderFirewall.
To open the firewall application settings, click Allow applications and features through Windows Defender Firewall.
The firewall options can be configured by clicking Change settings.
Below is a sample of all public and private fields that can be found in the Java (TM) Platform SE binary.
Select OK.

Disable Windows Defender Firewall

If you are having trouble connecting to the Minecraft server, you could also disable your Windows Defender firewall by opening the Windows Defender Control Panel applet.
The Control Panel applet contains other options, such as Enable or Disable Windows Defender Firewall.
(It is not recommended that you disable Windows Defender Firewall).
If you are satisfied with the settings, click OK.

Change the server information before connecting to the server

Using the Windows + R keys, you can manually enter the server address information before connecting.
The command prompt will be opened when you type cmd in the Open field. After that, press Enter.
Press Enter to run ipconfig.
The IPv4 address specified is important to note.
Once you’ve opened File Explorer, click on the File tab.
In File Explorer, navigate to the folder: Minecraft Servers folder – Maxwell (Random Numbers) – Minecraft Server.
You can open server.properties in Notepad by clicking on it.
In the server.properties file, note the port number.
You can play multiplayer in Minecraft by selecting “Play Multiplayer”.
You can join a server by selecting it.
A window with server information will open when you click the Edit button.
Select a server name from the drop-down list.
In the Address field, type XXX.XXX.X.X:YYYYYY. The X and Y represent IPv4 addresses and ports, respectively.
Then click Done.
Click on Refresh.
You can then join the server by clicking on the Join Server button.

RECOMMENATION: Click here for help with Windows errors.

Frequently Asked Questions

How do I fix a Netty I/O channel error?

Add exceptions to the firewall settings in the Minecraft folder.
Remove unstable software.
Add an IP address and select an appropriate working port.
Reboot the modem/router.
Use a reliable VPN connection source.
Update Java software.
Reinstall the Minecraft vessel.

How to fix IO Netty AbstractChannel AnnotatedConnectException Connection rejected No more information?

Restart Minecraft.
Reboot the computer.
Uninstall and reinstall Minecraft.
Uninstall and reinstall Java.
Change the firewall.
Restart your internet.

How do I fix the “Minecraft timed out” error?

Check your Minecraft servers.
Reset your network settings.
Allow Minecraft in your firewall.
Temporarily disable your antivirus software.
Use port redirection.
Change your version of Minecraft.
Use VPN services.

What does IO Netty mean?

Simply put, it's a connection error when the computer you're on tries to connect to the Minecraft server you chose, and that connection fails either because the server you connect to doesn't recognize your request or because it can't send the signal back to Minecraft.

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Mark Ginter

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog, techquack.com, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.