How to Fix Error Code 401003 in Diablo 4 – Lost Connection Issue

Looking for ways to fix Error Code 401003 in Diablo IV? Read on, because our guide will provide you with all the necessary steps.

Playing games online always carries the risk of connectivity issues. Blizzard’s flagship action RPG Diablo 4 is no different, and errors such as Error Code 401003 can grind your progress to a halt. This error can disconnect you from the game and cost you valuable time and game progression, so it’s reasonable to look for ways to fix it. While your game will be saved on the server, that doesn’t mean that the issue itself is benign. In this article, we will explain why you can get Error Code 401003 in Diablo 4 and how you can take steps to fix it. 

How To Fix Diablo 4 Error Code 401003

It can be frustrating to lose connection to Diablo 4 servers in the middle of gaming, but fortunately, there are a few solutions that can help you navigate the issue. Here are the steps that you can take to troubleshoot the problem:

1. Restart Diablo 4 and the Battle.Net client. In case the error was just a momentary problem, this should immediately reconnect you to the server.
2. Check your internet connection. If your computer or console can’t connect to the internet at all, this will indicate the source of the problem.
3. Reboot your modem and router. The standard “turning it off and on again” approach tends to work most of the time with small connectivity issues. While you’re at it, restart your PC or console too, just in case.
4. Check your firewall and anti-virus settings. It’s possible that one or both apps are randomly blocking Diablo 4 from connecting to the server. It’s good practice to add the game as an exception in the app’s settings to avoid this happening again.
5. Finally, check with your internet service provider. If your ISP is having an outage or some other problem with their network, you will at least know the culprit and get an estimation of when the problem will be resolved.

As you can see, it’s pretty easy to find the culprit for Error Code 401003. It’s not as worrisome as Error Code 315306 or as daunting as Error Code 395002, which can both cause you much more headache.

What is Error Code 401003

It is the unfortunate reality of online gaming that your internet connection can sometimes fail. This often results in connection loss between your device and the game’s servers. In the case of Error Code 401003, the issue lies with your side of the client. For that reason, it is up to you to find out the cause and resolve the issue before getting back to playing Diablo 4 on your platform of choice.