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[FIXED] League of Legends RADS Error

How to Fix League of Legends RADS Error in Windows 11

League of Legends is a solid game, but its player base often experiences various errors that prevent it from starting. This troubleshooting guide will show you how to fix the RADS Error in LoL.

LoL RADS Error

The RADS error indicates that League of Legends can’t establish a connection to the game’s HTTP server. The full error message says the following:

Could not connect to the HTTP Server. Please check that your internet connection is enabled and that your firewall is not blocking access.

What Causes the RADS Error?

You may experience this error due to misconfigured DNS settings, network connection, and host files. Your DNS plays an important role when connecting to a server. If it’s been misconfigured or runs into issues, you won’t be able to connect. Try flushing your system’s DNS cache and changing your default DNS server address.

In addition, this error may also occur if you don’t have sufficient permissions. In this case, the error may occur if a third-party process interferes with LoL. Try running the game as an administrator and add it to the Windows Defender Firewall list of exceptions.

Video Instructions on How to Fix League of Legends RADS Error

Table of Contents:

Method 1. Run League of Legends as an Administrator

Right-click the League of Legends launcher and click Properties

1. Right-click the League of Legends launcher and select Properties.

Select the Compatibility tab and mark Run this program as an administrator

2. Go to the Compatibility tab.

3. Mark the Run this program as an administrator checkbox.

4. Click Apply and click OK.

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Method 2. Add League of Legends to Windows Defender Firewall Exceptions List

1. Hold down Windows+R keys to open Run.

 Type in firewall.cpl in Run and click OK

2. In the Run dialog box, type in firewall.cpl and click OK.

Click Allow an app or feature through Windows Defender Firewall

3. In the Firewall settings window, click Allow an app or feature through Windows Firewall.

Click Change settings and click Allow another app

4. In the Allowed apps and features window, click Change settings.

5. Click Allow another app.

Click Browse

6. Then, click Browse.

Select LeagueClient and click Open

7. Navigate to the League of Legends installation location (C:\Riot Games\League of Legends by default)

8. Select LeagueClient.exe and click Open.

Click Add

9. Click Add.

Mark the Private and Public checkboxes next to League of Legends and click OK

10. Mark the checkboxes in the Private and Public columns next to League of Legends, and click OK.

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Method 3. Change Your DNS Server Address

1. Hold down Windows+R keys to open Run.

Type in ncpa.cpl and click OK

2. In the Run dialog box, type in ncpa.cpl and click OK.

Right-click the network adapter and click Properties

3. Right-click your network adapter and select Properties.

Select Internet Protocol Version 4 (TCP/IPv4) and click Properties

4. Select Internet Protocol Version 4 (TCP/IPv4) and click Properties.

Type in Preferred and Alternate DNS server addresses and click OK

5. Tick Use the following DNS server addresses.

6. In the Preferred DNS server, type in 1.1.1.1

7. In the Alternate DNS server, type in 1.0.0.1

8. Click OK to save settings.

9. Restart your PC for the changes to take effect.

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Method 4. Perform a DNS Flush

1. Hold down Windows+R keys to open Run.

Type in CMD and hold down Ctrl+Shift+Enter keys to open Command Prompt as an administrator

2. In the Run dialog box, type in CMD and hold down Ctrl+Shift+Enter keys to open the elevated Command Prompt.

Type in ipconfig /flushdns in Command Prompt and press Enter

3. In the Command Prompt window, type in ipconfig /flushdns and press the Enter key. Running this command will clear the DNS cache files and reset the DNS resolver cache.

4. Close the Command Prompt.

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Method 5. Modify the Windows Hosts File

1. Hold down Windows+E keys to open File Explorer.

Right-click the hosts file and click Properties

2. In the File Explorer address bar, type in C:\Windows\System32\drivers\etc and press the Enter key.

3. Right-click the hosts file and click Properties.

Select the Security tab and click Edit

4. Select the Security tab and click Edit.

Select your Windows admin account and mark Allow next to Full Control and click Apply

5. Select your Windows user, mark Full control in the Allow column, and click Apply.

Click Yes to confirm the action

6. Click Yes when prompted.

Right-click the hosts file and click Open with

7. Right-click the hosts file and click Open with.

Select Notepad and click OK

8. Select Notepad and click OK.

Type in 67.69.196.42 l3cdn.riotgames.com in the hosts file

9. Enter 67.69.196.42 l3cdn.riotgames.com at the bottom of the file.

10. Hold down Ctrl+S keys to save the changes and close Notepad.

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About the author:

Rimvydas Iliavicius

Rimvydas is a researcher with over four years of experience in the cybersecurity industry. He attended Kaunas University of Technology and graduated with a Master's degree in Translation and Localization of Technical texts. His interests in computers and technology led him to become a versatile author in the IT industry. At PCrisk, he's responsible for writing in-depth how-to articles for Microsoft Windows. Contact Rimvydas Iliavicius.

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