Fix: GameLoop Error Code 21 on Windows (HTTP Connection Issue)

Gameloop Error Code 21 typically occurs during the emulator’s installation or update process. This error is often related to a server refusing the connection, akin to a HTTP 403 ‘Forbidden’ error, which interrupts the process. The underlying causes usually involve regional restrictions or ISP-level blocks.

Additionally, interference from third-party antivirus software or misconfigured network settings can also trigger this error. Now that we’ve identified the likely causes, let’s explore the solutions to fix this problem.

1. Use a VPN to Bypass Regional Restrictions

A VPN helps bypass regional or ISP-imposed restrictions that may be blocking GameLoop’s connection to its update or installation servers. Using a VPN changes your virtual location by routing your internet traffic through a different server where GameLoop is accessible without limitations. This can ensure a consistent and stable connection to Tencent’s servers, resolving Error Code 21.

1. Download a reliable VPN provider such as ProtonVPN, NordVPN, or ExpressVPN.
2. Connect to a region where GameLoop services are working without issues (e.g., the US or Europe).
3. Launch GameLoop and verify if the issue is resolved.

2. Use the Incognito Tab

Using an incognito tab prevents cached sessions and outdated cookies from interfering with the installation or update process. It ensures the browser fetches fresh data directly from GameLoop’s servers instead of relying on previously stored files.

In some cases, even if the installer downloads correctly, it may fail to function due to caching issues. The incognito mode ensures that download links redirect properly and establish a clean connection with GameLoop.

1. Open Google Chrome or your preferred browser (e.g., Firefox, Microsoft Edge).
2. Click the three dots in the top-right corner and select New Incognito Window.
3. Navigate to the official GameLoop website, log in, and restart the installation or update process to check if the error is resolved.

3. Perform a Network Reset via Command Prompt

Resetting the network can resolve misconfigurations that block server communication. This process clears your DNS cache and resets IP settings, helping restore GameLoop’s access to its servers.

1. Press Win + S and type Command Prompt.
2. Right-click on it and choose Run as administrator.
3. Enter the following commands one by one, pressing Enter after each:

   netsh winsock reset
   netsh int ip reset
   ipconfig /release
   ipconfig /renew
   ipconfig /flushdns

   

4. Once all commands are executed, restart your computer to apply the changes.
5. Reopen GameLoop and check whether Error Code 21 still appears.

4. Disable Third-Party Antivirus Software

Interference from third-party antivirus software is another possible cause of this error. Some antivirus tools mistakenly block GameLoop’s installer or its connection to the server. Disabling the antivirus temporarily can help determine if it’s the source of the problem.

1. Find your antivirus software icon in the system tray at the bottom-right corner of your screen.
2. Right-click on the icon and select options such as Disable, Pause Protection, or Turn Off Protection.
3. Open GameLoop and see if Error Code 21 still occurs.

If none of the above methods work, try switching to a different browser. This can eliminate any browser-specific issues or conflicts caused by outdated cache or cookie data. Using a clean browser environment may resolve the connection problem and allow the installation to proceed without interruptions.