5 Ways to Fix the League of Legends Login Session Error on a Windows PC

Many League of Legends players have been unable to play LOL because of a login session error that occurs when they launch the client for that game. A LOL player’s Reddit post said this about the issue, “Just like the title said, I haven’t been able to play League for a month now because of a message when my client starts ‘There was an unexpected error with the login session.’” This is how you can fix that League of Legends login session error on a Windows PC.

Read also: 7 Ways to Fix League of Legends Not Launching on a Windows PC

Sign Out and Back Into Your Riot Account

First, try signing out and back into your Riot account. This is the official Riot resolution for fixing the League of Legends login session error. You can sign out and into your Riot account like this.

1. Open the Riot Client for League of Legends.
2. Click the button for your profile icon at the top-right corner of the client window to select Sign out.
   
   

   The Sign Out option in the LOL client

3. Bring up Task Manager using the Ctrl + Shift + Esc hotkey for accessing that tool.
4. Close all the LeagueofLegends.exe and RiotClientServices.exe processes you might see in Task Manager’s Processes tab by right-clicking them and selecting End task.
   
   

   The End task option in Task Manager

5. Also, look for and end the KillerServiceNetwork.exe process if you can find it.
6. Return to the Riot client and input the required account details to log back in.
   
   

   The Riot account sign in boxes

Change DNS Server Settings

Some LOL players confirm they’ve fixed the League of Legends login session error by changing their DNS servers to Cloudfare. You can also try switching your DNS to Google instead. Applying this resolution can potentially resolve the issue because it will set a more reliable DNS server on your PC. This is how you can set a Cloudfare DNS.

1. To launch Run, right-click the Windows Start button and select the shortcut for that accessory on the Power User menu.
2. Input a ncpa.cpl command for the Network Connections applet in Run and press OK.
3. Right-click on the network adapter for your internet to select a Properties context menu option for it.
4. Double-click Internet Protocol Version 4 to access the window for IPv4 settings.
5. Click the Use the following DNS server addresses radio button to activate DNS server address boxes.
   
   

   The Use the following DNS server addresses option

6. Type 1.1.1.1 into the Preferred DNS box.
7. Enter 1.0.0.1 inside the Alternative DNS box.
8. Click OK to exit the IPv4 window.

Disable VPNs

A few players say disabling VPNs on PCs can resolve the League of Legends login session error. So, try disabling any VPN connection on your PC. This is how you can disable a VPN via the Control Panel in Windows.

1. Open Network Settings in the Control Panel, as covered in the first two steps of the previous resolution.
2. Select the adapter for your VPN connection in the Network Connections applet.
3. Click the Disconnect this connection or Disable this network device option for the VPN.
   
   

   The Disable the network device option in Control Panel

Temporarily Windows Defender Firewall

Windows has a built-in firewall that can cause connection issues for games and their clients to occur when not allowed through it. So, try temporarily disabling the Windows firewall before launching the LOL gaming client to see if that helps. This Microsoft page tells you how users can disable the Windows 11/10 firewall.

The Windows Defender Firewall options

If doing this resolves the League of Legends login session error, don’t always leave your firewall off. You can temporarily disable that firewall before playing League of Legends. Alternatively, add the Riot client to the firewall’s allowed list by following the steps on this Microsoft Windows help webpage.

Reset Your PC’s Network

This final League of Legends login session error will restore your internet network settings to default. Make sure you have your internet password at hand to re-establish your connection after resetting the network. This is how you can select the option for resetting the network.

1. Activate the file search tool by pressing the Windows logo key + S.
2. Type in a network reset search phrase.
3. Select Network reset in the search results.
4. Click Reset now in Settings.
   
   

   The Reset now option

5. Select Yes to confirm you’re sure about resetting your network.
6. Restart your PC and re-establish your internet connection.

The resolutions outlined here usually fix the League of Legends login session error on Windows 11/10 PCs. This does not mean they will always work, but they’ll probably fix that issue for most LOL players. Consider contacting the Riot support team by clicking Submit a ticket on this help page if this LOL error persists after applying all the potential resolutions above.