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How to Fix Diablo 4 Error Code 401003

Diablo IV is one of the most anticipated games of 2023 and for good reason. With its immersive storyline and thrilling gameplay, players are sure to be hooked from the get-go. However, like with any new release, there are bound to be some issues that need fixing. One such issue is the Diablo 4 Error Code 401003. Fear not, dear reader, as this beginner’s guide will walk you through the steps on how to fix Diablo 4 Error Code 401003.

How to Fix Diablo 4 Error Code 401003

What is Diablo 4 Error Code 401003 and How To Fix?

Before diving into the solution, it’s important to understand what Error Code 401003 is. This error occurs when the game client loses its connection to the server. This can happen due to a variety of reasons, such as a poor internet connection or server overload.

Check Your Internet Connection

The first step to fixing Error Code 401003 is to check your internet connection. Ensure that your connection is stable and that you have a strong signal. If you’re on Wi-Fi, try switching to a wired connection. This can improve your connection speed and stability.

Update Your Game

Another common cause of Error Code 401003 is an outdated game client. Make sure that your game is up to date with the latest patches and updates. Blizzard Entertainment frequently releases updates to fix bugs and improve performance, so it’s essential to keep your game client updated.

Check Server Status

Sometimes, Diablo 4 Error Code 401003 can occur due to server overload or maintenance. Check the official Diablo IV Twitter account or website for any announcements regarding server status. If the servers are down, there’s not much you can do but wait until they come back online.

Disable Firewall/Antivirus Software

Firewall and antivirus software can sometimes interfere with the game client’s connection to the server, resulting in Error Code 401003. Try temporarily disabling your firewall or antivirus software and see if this resolves the issue. Just make sure to re-enable them once you’re done playing.

Contact Support

If none of the above solutions work, it’s time to contact support. Blizzard Entertainment has a robust support system, and their customer service representatives are well-equipped to help you with any issues you may be experiencing.

How to Fix Diablo 4 Error Code 401003


Error Code 401003 can be a frustrating issue to deal with, but it’s not impossible to fix. By following the steps outlined in this beginner’s guide, you should be able to resolve the issue and get back to playing Diablo IV in no time. Remember, if all else fails, don’t hesitate to contact support. Happy gaming!

Masab Farooque is a Tech Geek, Writer, and Founder at The Panther Tech. He is also a lead game developer at 10StaticStudios. When he is not writing, he is mostly playing video games