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How To Fix Diablo 4 Can’t Join Online Co-Op

Diablo 4, the highly anticipated action role-playing game by Blizzard Entertainment, offers an immersive multiplayer co-op experience that allows players to team up with friends and conquer the forces of Hell together. Joining forces with allies not only adds an extra layer of excitement to the game but also enhances your chances of overcoming challenging battles and defeating formidable enemies. However, some players have encountered issues when trying to join online co-op in Diablo 4, experiencing error code 316748 or facing difficulties in connecting with friends. In this article, we will provide you with a guide on how to fix the Diablo 4 can’t join online co-op issue, ensuring you can fully enjoy the multiplayer aspect of this thrilling game.

How To Fix Diablo 4 Can’t Join Online Co-Op

How To Fix Diablo 4 Can’t Join Online Co-Op

Check Server Status and Connection

Before troubleshooting any technical issues, it’s essential to ensure that the game’s servers are operating smoothly and that your internet connection is stable. Visit the official Diablo 4 website or relevant gaming forums to check if there are any reported server outages or maintenance periods. Additionally, perform a speed test on your internet connection to rule out any connectivity problems that might be hindering your ability to join online co-op.

Verify Game Files and Update

Corrupted game files or outdated game versions can often cause connectivity issues. To address this, follow these steps:

  • For PC: Open the Blizzard Battle.net launcher and navigate to the Diablo 4 game page. Click on the options menu (gear icon) and select “Scan and Repair” from the dropdown menu. This process will verify the integrity of the game files and repair any corrupted data.
  • For console: Check for available updates for Diablo 4 in your console’s system settings or game library. Make sure you have the latest version installed to ensure compatibility with online co-op features.

Adjust Firewall and Antivirus Settings

Firewall or antivirus software on your computer may sometimes block the necessary network connections required for online co-op. To resolve this, try the following:

  • Temporarily disable your firewall or antivirus software and attempt to join online co-op in Diablo 4. If the issue is resolved, add Diablo 4 to the exceptions or whitelist in your security software to allow uninterrupted network access.
  • If you’re unsure how to modify firewall or antivirus settings, consult the documentation provided by the respective software or contact their customer support for assistance.

Port Forwarding

In some cases, port forwarding can help establish a more stable connection for online multiplayer. To configure port forwarding for Diablo 4, follow these general steps:

  • Access your router’s settings by entering its IP address in a web browser.
  • Locate the port forwarding or virtual server settings in your router’s interface.
  • Add a new rule to forward the necessary ports for Diablo 4. The required ports can be found in the game’s documentation or by referring to online resources.
  • Save the changes and restart your router to apply the new settings.

Contact Customer Support

If you have followed all the previous steps and are still unable to join online co-op in Diablo 4, it is recommended to reach out to Blizzard Entertainment’s customer support. Provide them with detailed information about the issue you are experiencing, including any error codes or error messages received. The customer support team will be able to provide personalized assistance and guide you through additional troubleshooting steps if necessary.

How To Fix Diablo 4 Can’t Join Online Co-Op


Diablo 4 offers an exciting multiplayer co-op experience where players can team up with friends to tackle the challenges of Sanctuary together.

If you encounter the “Diablo 4 can’t join online co-op” issue, follow the troubleshooting steps outlined in this article.

By checking server status, verifying game files, adjusting firewall settings, configuring port forwarding, and seeking assistance from customer support if needed, you can overcome these connectivity hurdles and immerse yourself in the thrilling world of Diablo 4’s multiplayer co-op.

Embark on epic adventures, vanquish demonic forces, and create unforgettable memories with your allies as you fight to save Sanctuary.

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