Killing Floor 3 EOS authentication failed error: Possible fixes and reasons

The Killing Floor 3 EOS authentication failure is keeping players from joining matches or getting into the game. These issues have been reported across various community forums like Killing Floor 3's subreddit and Steam discussions for KF3. In this article, we shall go over a few possible fixes for the Killing Floor 3 EOS authentication failed error.

Note: The potential solutions mentioned herein are not guaranteed to work for every user.

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Possible solutions for Killing Floor 3 EOS authentication failure

Probable reasons for EOS authentication failure

EOS authentication failure can potentially mean that EasyAntiCheat is unable to initialize a connection through your system. This can be due to network problems or possible file corruption.

Possible solutions

There are a few ways for players to address the EOS authentication failure error in Killing Floor 3. It is recommended that you review all the different solutions to ensure the best chance of resolving this error.

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1) Restart your system

As unintuitive as it might seem, restarting your system can be one of the easiest ways to deal with Killing Floor 3 EOS authentication failure. Various Redditors in the r/KF3 subreddit have mentioned that restarting the system has often yielded positive.

Restart your system to see if the error gets resolved (Image via Tripwire Interactive)

Take your time and make sure all your unsaved data is taken care off. After that, do a clean restart, i.e., shut down your system and manually boot it back up.

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2) Verify game file integrity

Sometimes, corrupt game files can lead to various issues arising in-game. So, follow these steps to check the integrity of your game file installation:

• Open Steam and head to your Library.
• Right-click on Killing Floor 3, and click on Installed Files.
• Select the small button on the right side that says Verify integrity of game files.
• This process will take some time, so wait patiently.
• After this is done, try restarting the game to check whether the Killing Floor 3 EOS authentication failure has been fixed

Verify integrity of game files (Image via Sportskeeda || Steam)

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3) Reinstall EasyAntiCheat

Since the Killing Floor 3 EOS authentication failure is linked to the anti-cheat, reinstalling this is one of the primary solutions. Just follow these steps:

• Open Steam and head to your Library.
• Right-click on Killing Floor 3, hover over Manage, and then click on Browse local files.
• Once the game installation folder opens up, navigate to the folder that is titled EasyAntiCheat.
• Once here, click on EasyAntiCheat_EOS_Setup to reinstall the anti-cheat for KF3.
• After this, restart your system and open up the game to check if the issue is fixed.

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Additional solutions

Sometimes, various executable files from games can get flagged as malicious items by antivirus programs. To ensure this isn't the case, open your antivirus program to ensure no such activity has occurred. If no third-party antivirus program is present, go through Windows Defender to ensure it hasn't flagged KC3 files as malicious threats.

If all of these solutions fail to resolve your Killing Floor 3 EOS authentication failure error, contact Tripwire Interactive Support to raise a ticket and wait for a resolution.

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For more information on the game, follow Sportskeeda:

• What is Enfeeble in Killing Floor 3?
• Killing Floor 3 Year 1 roadmap explained
• Best Killing Floor 3 graphics settings