How to fix ‘Unable to connect to authentication service’ in League of Legends

A quick fix, if you know where to look...

While playing multiplayer games, I'm not afraid of other players, as my biggest enemy is the infamous server error. That is the only opponent that can make me quit the game, so avoiding any server issues is my top priority, especially when I play League of Legends. Here's how to fix "Unable to connect to authentication service" in League of Legends.

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How to solve the 'Unable to connect to authentication service' error in LoL

There are several solutions for the "Unable to connect to authentication service" error in LoL. There is always a chance that you've encountered an entirely new type of bug, but even then, you can try these three things:

  • Update your firewall
  • Check the service status
  • Change your DNS settings.

Update or turn off your firewall

Chances are, your firewall needs an update. Although the firewall isn't prone to disrupt communication with League of Legends, an outdated one can cause the error. In this instance, you will need to update it. Alternatively, you can temporarily turn off the firewall altogether.

How to turn off the firewall

  1. Click Start
  2. Click Control Panel
  3. Click System Security
  4. Click Windows Firewall
  5. Click Turn Off

Check the service status in League of Legends

Although the root of the "Unable to connect to authentication service" problem could very well stem from your LoL settings, Riot Games has also been known to play the culprit in the past. Checking the LoL server status can determine whether or not the issue is with your hardware or Riot Games. If it's the latter, you can only wait until the problems are resolved.

Related: How to fix League of Legends Error 5C ‘Trouble fetching information for this player’ bug

Change your DNS settings

Changing your DNS settings is another way to remove the "Unable to connect to authentication service" bug in League of Legends. To do this, you must swap your current settings out for Google Public DNS, which is,

  1. Click Start
  2. Click Control Panel
  3. Click Network and Internet
  4. Click Network and Sharing Center
  5. Click Change Adapter settings
  6. Right-click on your Network (Ethernet or Wi-Fi) and select Properties
  7. Check the Internet Protocol Version 4 (TCP/IPv4)
  8. Click Properties
  9. Check Use the following DNS server addresses
  10. Input,

For more League of Legends content, check out the How to fix 'trouble fetching information' error on League of Legends right here on Pro Game Guides.

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About the Author

Nebojša Prijić is a staff writer at Pro Game Guides. He's an old-school gaming journalist that loves real-time strategies, shooters, and RPGs. He remembers the first Diablo, PC games on a single floppy disk, and playing Mortal Kombat on the keyboard.
Find Nebojša Prijić On: Twitter

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How to fix ‘Unable to connect to authentication service’ in League of Legends

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