How to Fix Rainbow Six Siege Error 0-0x00000001

When Error Code 0-0x00000001 appears in Rainbow Six Siege, the game fails to connect to its servers. This error usually pops up while the game is stuck on “Updating Security Measures,” indicating that the BattlEye anti-cheat service cannot initialize or reach its servers. A frequent cause is security software (third-party AV, firewall rules, or aggressive exploit protection settings) blocking BattlEye.

Other factors—such as corrupted game files, insufficient permissions, or a slow/unstable internet connection—can also cause this error.

Now that you know the likely causes, let’s walk through the solutions.

1. Check Server Status

Before trying any fixes, it’s a good idea to check if the issue is caused by a server outage. Sometimes, this error can occur simply because Ubisoft’s servers are temporarily down or undergoing maintenance. Verifying the server status helps you determine whether the problem is on your end or with Ubisoft. You can check the server status on Ubisoft’s official website.

2. Run as Administrator

This error can sometimes occur due to insufficient system permissions. Running the game as an administrator ensures it has full access to the files, services, and system-level permissions it needs to function properly—especially when initializing components like BattlEye. Right-click the game’s shortcut and select “Run as administrator” to see if this resolves the issue.

1. Navigate to your Rainbow Six Siege installation folder (default location):

   C:\Program Files (x86)\Steam\steamapps\common\Tom Clancy's Rainbow Six Siege

   Tip: You can also access this through Steam by right-clicking the game > Manage > Browse local files

2. Find RainbowSix.exe in the folder, right-click it, and select Properties from the context menu.
3. In the Properties window:
   • Switch to the Compatibility tab
   • Check the box for Run this program as administrator

   

4. Click OK to save changes, then launch the game normally through Steam or your desktop shortcut.

3. Verify Game Files

Corrupted or missing game files can prevent the game from running properly, especially if essential files fail to load. This can lead to errors like 0-0x00000001. Verifying the game files will scan for any damaged or missing data and automatically re-download the necessary files, which may help resolve the issue.

1. Launch Steam and navigate to your Library tab (game collection).
2. Right-click on the game experiencing issues and select Properties from the dropdown menu.
3. In the Properties window:
   • Select the Local Files tab from the left sidebar
   • Click the Verify integrity of game files button

   

4. Wait for the verification process to complete (this may take several minutes depending on your game size and system speed). Steam will automatically download any missing or corrupted files.

4. Turn Off Antivirus

Temporarily turning off your antivirus software can help resolve this error, as some antivirus programs may interfere with the game or the BattlEye anti-cheat service. This conflict can prevent the game from initializing properly. Disabling your antivirus stops it from blocking or restricting essential processes, which may allow the game and anti-cheat to function without interruption.

Note: This is just a temporary troubleshooting step. Be sure to re-enable your antivirus afterward or add Rainbow Six Siege and BattlEye to your antivirus exclusion list.

1. Type Virus & threat protection in the Windows search bar
2. Select and open the matching result.
3. Under “Virus & threat protection settings”
4. Click Manage settings
5. Find Real-time protection and toggle the switch to Off
   • Note: Windows may warn you about reduced protection—this is temporary

   

6. Now check if the issue persists.