How To Fix Rainbow Six Siege Synchronization Failed Error (2026)
Getting the "Synchronization Failed" error when trying to launch Rainbow Six Siege? This error usually occurs when Ubisoft Connect cannot properly sync your save data or verify your files due to permission issues. The good news is this fix is simple and takes just a few minutes. In this tutorial, I walk you through the exact steps to resolve this error by setting the correct administrator permissions for all Ubisoft executable files.
Step 1: Locate Your Ubisoft Launcher Installation Folder
First, we need to find where Ubisoft Connect is installed on your system. This is where all the executable files we need to modify are located.
Open File Explorer by pressing Windows + E on your keyboard. Navigate to your main drive where Ubisoft Connect is installed (usually C:). Go to Program Files (x86) - Ubisoft - Ubisoft Game Launcher . This is the default installation path. If you installed Ubisoft Connect in a custom location, navigate to that folder instead. Take a moment to familiarize yourself with the files in this folder—you will see several .exe files including UbisoftConnect.exe, Upc.exe, and others.
Step 2: Make Sure Ubisoft Launcher is Completely Closed
Before modifying any files, we must ensure Ubisoft Connect is not running. Having the launcher open while changing permissions can cause conflicts or prevent the changes from saving properly .
Look at your system tray (bottom-right corner, near the clock). Right-click the Ubisoft Connect icon if it appears and select "Exit" or "Quit." Next, open Task Manager by pressing Ctrl + Shift + Esc. Look for any Ubisoft-related processes in the list such as "Ubisoft Connect," "Ubisoft Game Launcher," or "Upc.exe." If you see any, right-click them and select "End task" . This ensures all Ubisoft processes are completely shut down before we proceed.
Step 3: Set All Four Executable Files to Run as Administrator
Now we modify the properties for the key Ubisoft executable files. This gives them the necessary permissions to sync properly with Rainbow Six Siege .
In your Ubisoft Game Launcher folder, locate the following four executable files:
UbisoftConnect.exe
Upc.exe
UbisoftGameLauncher.exe
UbisoftGameLauncher64.exe
Right-click on the first file (UbisoftConnect.exe) and select "Properties." Go to the "Compatibility" tab. Check the box that says "Run this program as an administrator." Click Apply, then OK . Repeat this exact process for all four files: Upc.exe, UbisoftGameLauncher.exe, and UbisoftGameLauncher64.exe. Take your time and ensure each one is set correctly.
Step 4: Restart Your PC and Launch Rainbow Six Siege
With all permissions set and the launcher closed, a full system restart ensures all changes take effect properly.
Click the Start menu, select Power, and choose Restart. Wait for your PC to fully reboot. Once back at your desktop, launch Ubisoft Connect normally—it should now open with administrator privileges automatically. Start Rainbow Six Siege from your library. The "Synchronization Failed" error should now be resolved, and your game should sync properly .
These steps—closing Ubisoft completely, locating the launcher folder, setting all four executables to run as administrator, and restarting your PC—fix the synchronization error for the vast majority of Rainbow Six Siege players. Try them and let me know in the comments if this resolved your issue.
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