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How to fix League of Legends Error Code 999?

Published on April 9th, 2022

There is no specific information on error code 999 for League of Legends, but it seems to be a general connection error. This could happen for a variety of reasons, such as your internet connection being unstable, the League of Legends servers being down, or there being some sort of problem with your account. If you are encountering this error, you should try restarting your game client and/or your computer, and if that doesn't work, you can try contacting Riot Games customer support.

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1. Check your internet connection

  1. In order to check your internet connection, open up your web browser and type in "www.speedtest.net". This will open up a page that will allow you to test your internet speed.
  2. Next, click on the "Test Your Speed" button.
  3. On the next page, you will be asked to enter your internet connection information. This information will include your IP address, the type of connection you have (cable, DSL, etc.), and the time of the test.
  4. Once you have entered all of your information, click on the "Start Test" button.
  5. The speed test will now begin and will take a few minutes to complete. Once it is finished, the results will be displayed on the page.
  6. If your internet speed is not the same as it was when the test started, then you may need to fix your internet connection. To do this, you will need to find the problem and fix it. There are many ways to fix this, so it is up to you to find the best way to do it.

2. Check your League of Legends installation

  1. Open League of Legends and click the “Help” button in the top-left corner.

  2. Click the “Support” tab.

  3. Click the “Troubleshooting Information” button.

  4. Click the “System” button.

  5. Click the “Diagnostics” button.

  6. Click the “League of Legends” button.

  7. Click the “Error Log” button.

  8. Review the “League of Legends” error log.

  9. If you see a “League of Legends” error code, follow the instructions below to fix it. If you see an error code that starts with “999,” please follow these instructions:

  10. Close League of Legends.

  11. Uninstall League of Legends.

  12. Reinstall League of Legends.

  13. If you are still experiencing problems, please contact us.

3. Check your Firewall settings

  1. In your internet browser, go to "settings" and under "advanced" click on "firewall."
  2. Under "firewall settings," make sure that the "public networks" and "LAN" options are checked.
  3. If the "public networks" option is not checked, click on it and make sure that it is checked.
  4. If the "LAN" option is not checked, click on it and make sure that it is checked.
  5. If the "public networks" and "LAN" options are both checked, make sure that the "block all traffic" option is not checked.
  6. If the "block all traffic" option is not checked, make sure that it is checked.
  7. Make sure that the "firewall exceptions" option is not checked.
  8. If the "firewall exceptions" option is not checked, make sure that it is checked.
  9. If the "firewall exceptions" option is checked, make sure that the "league of legends" exception is checked.
  10. If the "league of legends" exception is checked, make sure that the port number is set to "8080."

4. Temporarily disable your Antivirus software

  1. Open the Settings app on your Android device
  2. Select Security
  3. Select Antivirus
  4. Toggle the switch next to your antivirus software to "off"
  5. In the "Confirm Antivirus disable" dialog box, tap "Yes" to disable your antivirus software

Some users might also have success with the following opitons:

  1. Check your Antivirus settings
  2. Run the League of Legends Repair Tool
  3. Re-install League of Legends