Full Fix: League of Legends RADS error on Windows 10, 8.1, 7

By: Madeleine Dean
7 minute read

RADS errors are some of the most common errors affecting League of Legends. They prevent gamers from actually connecting to LoL’s servers. The complete error message is usually 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.

Here’s how one gamer describes this issue:

I just got a new computer with Windows 10 installed. I Installed LoL with no problem but when I try to launch the game it gives me RADS Error. I’ve read everything in the forum about it and tried everything but nothing seems to work.

If you currently can’t join LoL due to RADS errors, you’ve come to the right place. In this article, we’re going to list a series of workarounds that will help you to fix these errors.

How to fix League of Legends RADS errors

Many League of Legends players reported that they can’t start the game due to RADS error. Speaking of this error, here are some similar issues that users reported:

  • League of Legends RADS error Windows 10, 8.1, 7 – This error can appear on almost any version of Windows and prevent you from running the game. Most of our solutions are fully compatible with older versions of Windows, so feel free to try them.
  • Could not connect to the http server League of Legends – Sometimes you might get this error message while trying to start League of Legends. To fix that, be sure to check your firewall and antivirus, and make sure that League of Legends is allowed to through it.
  • League of Legends RADS error unspecified error occurred, connection lost to http server, game crash – These are some variations of the original error RADS error, and if you encounter them, be sure to try some of our solutions.

Solution 1 – Run the LoL Patcher as an Administrator

According to users, one of the simplest ways to fix RADS error is to run LoL Patcher as an administrator. This is rather simple, and you can do it by following these steps:

  1. Navigate to League of Legend’s installation directory.
  2. Now locate LoL Patcher, right-click it and choose Run as administrator from the context menu.
    Could not connect to the http server League of Legends

After doing that LoL Patcher should start and the problem will be resolved. This might not be a permanent solution, but if the RADS error ever appears again, be sure to repeat these steps.

Solution 2 — Add LoL to your exceptions list

Sometimes RADS error can appear due to issues with the firewall. League of Legends might be blocked from accessing the Internet by your firewall, and that can cause this issue to appear. To fix the problem, it’s advised to change your firewall settings by doing the following:

  1. Go to Search > type Windows Firewall > go to Allow an app or feature trough Windows Firewall.
    League of Legends RADS error game crash
  2. Add  lol.launcher.exe to your firewall’s exceptions list.
  3. Launch the game again.

Solution 3 — Change your DNS

Your DNS settings can sometimes cause RADS error to appear in League of Legends. However, many users reported that they fixed the problem simply by switching to Google’s DNS. This is quite simple, and you can do it by following these steps:

  1. Go to the Control Panel > Network and Internet > Network and Sharing Centre > Change adapter settings (left-hand side).
    Could not connect to the http server League of Legends
  2. Right-click on your Wifi/ Ethernet connection> click Properties.
    League of Legends RADS error connection lost to http server
  3. Select Internet Protocol Version 4 (TCP/IPv4) > go to Properties.
    League of Legends RADS error Windows 7
  4. Select the Use the following DNS server addresses option > Preferred DNS server:, Alternative DNS server:
    Could not connect to the http server League of Legends
  5. Click OK > close everything > open League of Legends again.

If you get the same error again, follow the same steps, but select the “Obtain DNS server address automatically” option.

Solution 4 — Tweak file hosts

Sometimes your hosts file can cause League of Legends RADS error to appear. To fix the problem, it’s required that you manually make changes to your hosts file. We have to mention that this is a system file, so it’s protected by your PC.

Many users reported Access Denied message while trying to edit hosts file, but we explained how to avoid this problem in one of our older articles, so be sure to check it out. To fix the RADS error, you just need to edit the hosts file by following these steps:

  1. Go to: C:\Windows\System32\drivers\etc.
  2. Locate file hosts > open it with Notepad > add this line to bottom: l3cdn.riotgames.com > save it > launch the game again.

Solution 5 – Change system.cfg file

According to users, you might be able to fix League of Legends RADS error simply by making a few adjustments to the system.cfg file. To do that, you just have to follow these steps:

  1. Go to C:\Riot Games\League of Legends\RADS\system.
  2. Now locate system.cfg file, right-click it and choose Open With > Notepad.
    League of Legends RADS error Windows 10
  3. One you open the file, remove everything and paste the following lines:
    • DownloadPath = /releases/live
    • DownloadURL = l3cdn.riotgames.com
    • Region = EUW
  4. Save changes in Notepad.

After doing that, try running Patcher again and the issue should be resolved.

Solution 6 – Check your antivirus

A common cause for League of Legends RADS error can be your antivirus or firewall. If you can’t start the game due to this error, it’s rather likely that a third-party antivirus is interfering with your game.

To fix the problem, it’s advised to check your antivirus settings and try disabling certain features such as your firewall. If that doesn’t work, you might have to completely disable your antivirus and check if that helps.

In worst case scenario, you might have to completely uninstall your antivirus. If uninstalling the antivirus solves the issue, you should consider switching to a third-party antivirus software. There are many great antivirus tools on the market, but if you’re looking for an antivirus that won’t interfere with your gaming sessions, we suggest you try out Bitdefender (currently World’s Nr. 1 antivirus).

Solution 7 – Restart your modem

According to users, this problem can sometimes appear due to problems with your network connection. The easiest way to fix that is to restart your modem. This is quite simple, and you can do it by following these steps:

  1. Press the power button on your modem to turn it off.
  2. Wait for about 30 seconds. Now press the power button again to turn on your modem.

Once your modem is turned off, the network settings will restart and the problem should be resolved.

If you don’t want to turn off your modem, you can try using ipconfig /flushdns command. To do that, just follow these steps:

  1. Press Windows Key + X to open Win + X menu. Now choose Command Prompt (Admin) or Powershell (Admin) from the menu.
    League of Legends RADS error unspecified error occurred
  2. When Command Prompt starts, run ipconfig /flushdns command.
    League of Legends RADS error Windows 8.1

After running this command, check if the problem is resolved. Keep in mind that you might have to repeat this solution whenever the RADS error appears.

Solution 8 – Use CCleaner

Several users reported that they encountered RADS error due to certain temporary files. However, they managed to solve the issue simply by removing those files with CCleaner. If you’re not familiar, CCleaner is a simple and powerful tool that can remove old and unnecessary files from your PC.

Once you remove these files, try to start the game again and check if the problem is still there.

Solution 9 – Stop all RADS processes

Sometimes you might encounter League of Legends RADS error due to RADS processes running in the background. To fix the issue, you need to manually stop all RADS processes. This isn’t that hard, and you can do it by following these steps:

  1. Press Ctrl + Shift + Esc to start Task Manager.
  2. Once Task Manager starts, go to the Processes tab. Now locate any rads process, right-click it and choose End task from the menu.
    League of Legends RADS error Windows 10

After ending all RADS processes, try to start the game again.

Solution 10 – Reinstall the game

If the RADS error still appears, your only option might be to reinstall the game. There are several ways to remove League of Legends, but the best method might be to use an uninstaller software.

In case you’re not familiar, uninstaller software is a special application that can completely remove any application from your PC. These applications are great if you want to completely uninstall a certain program from your PC.

If you’re looking for good uninstaller software, we would have to recommend IOBit Uninstaller. Once you remove the game using this tool, reinstall it and the problem should be resolved.

There you go, we hope that one of these solutions helped you to get rid of the RADS errors and launch LoL. If you’ve come across other solutions to fix this issue, you can list the troubleshooting steps in the comment section below.

Editor’s Note: This post was originally published in April 2017 and has been since completely revamped and updated for freshness, accuracy, and comprehensiveness.


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