This particular error is mostly caused when the Minecraft servers are glitched or your connection isn’t stable. Minecraft requires the users’ connection to be stable and constant in order for it to successfully establish an inflow and outflow of data. Therefore, a faulty connection either on the users’ side or Minecraft’s’ side causes this error.
Solution 1: Power Cycle the Internet Router
In some cases, the error is displayed when the internet cache that has been built up by the router is corrupted and it prevents the user from establishing a secure connection with the servers. This error can also cause the connection to timeout. Therefore, in this step, we will be getting rid of that cache by completely power-cycling the internet router. For that:
Solution 2: Restart Launcher
Sometimes, the game doesn’t launch properly due to which some files aren’t loaded completely. This issue can also prevent the game from connecting to a world. Therefore, in this step, we will be completely restarting the launcher and the game to get rid of this problem. In order to do that:
Solution 3: Use Direct Connect
In some cases, instead of connecting through the server list we can use the direct connect feature in the multiplayer to connect to the server. Since this problem is most prevalent with the “Hypixel” server, we will be using direct connect to get into it. For that:
Solution 4: Logout and Log Back into the Minecraft Launcher
A temporary glitch between your system and Minecraft servers may cause the ‘failed to authenticate’ issue (especially, if you have recently changed your user’s name in Minecraft) and may get cleared if your log out/log in to the Minecraft launcher.
Solution 5: Rejoin the Hypixel Server
A temporary glitch between your system and the Hypixel server may result in the ‘failed to authenticate’ issue. The glitch may get cleared if you rejoin the server.
Solution 6: Edit the Hosts File
You may fail to authenticate your connection when using the Hypixel server if the Hosts file blocks your system’s access to an essential resource for the operation of the Minecraft launcher (usually, due to the use of an application like MCLeaks).
Solution 7: Allow the Minecraft Traffic in the System’s Firewall
The Hypixel failed to authenticate your connection issue may arise if the Firewall of your system is blocking access to a resource essential for the operation of the Minecraft launcher. For illustration, we will discuss the process for the Windows Defender Firewall, you may follow the instructions as per your Firewall product. Warning: Proceed at your own risk as editing the Firewall settings is a proficient task and if done wrong, you may expose your system/data to threats. If the issue persists, then check if allowing the port 25565 in the Firewall settings (Action» New Rule» Port) resolves the issue. If that did not do the trick, make sure the router’s (or corporate) Firewall is not blocking access to port 25565.
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