How to Fix Rainbow Six Siege Synchronization Failed Error

Tom Clancy’s Rainbow Six Siege Synchronization Failed Error only happens with the achievements in Ubisoft Connect on the PC which literally troubles a lot of players. Whenever you try launching the Rainbow Six Siege game, an error message appears saying that “Failed to Synchronize Achievements” or “Not Synchronizing Data” and affected players are forced to skip. As a popular first-person shooter title, the game needs accurate server synchronization with the game saves and achievements. But sadly that’s not the thing right now.

This particular synchronization failed error can easily frustrate unfortunate players while starting on the PC. Though the older Uplay client has become Ubisoft Connect, the in-game progress and achievements still affect the gaming experience. It mostly occurs on both the Ubisoft Connect and Steam version, which is another major setback. Now, if you’re also encountering the same kind of issue then make sure to check out this troubleshooting guide to fix it.

How to Fix Rainbow Six Siege Not Synchronizing Data Error

Here we’ve mentioned several potential solutions below that can help in fixing the synchronization failed error on the PC. The chances are high that corrupted game files, an outdated game version, Windows Firewall blocking, unnecessary background tasks, internet connectivity issues, and more can be multiple reasons. Make sure to follow all methods one by one until the problem gets fixed. So, without wasting any more time, let’s jump into it.

1. Reboot the PC

First, you should reboot the computer to easily refresh the temporary system glitch or cache data issue that might trouble a lot of server connectivity. Make sure to shut down the PC and then unplug the power cord from the socket to power cycle the device at the same time. Some users did find this trick useful. So, try it once.

2. Run the Game as an administrator

Make sure to run the game executable file and the launcher application as an administrator to avoid user account control regarding privilege issues. To do this:

Right-click on the Rainbow Six Extraction exe application file on your PC.
Now, select Properties > Click on the Compatibility tab.

Click on the Run this program as an administrator checkbox to select it.
Click on Apply and select OK to save changes.
Once done, make sure to do the same steps for Ubisoft Connect too.

3. Update Rainbow Six Siege

Sometimes an outdated game version can also bring multiple bugs or issues such as game save issues as well as in-game achievement updating issues. It’s better to update your Rainbow Six Siege game by following the steps below. If an update is available, then install the latest patch. To do this:

For Steam:

Open the Steam client > Go to Library.
Click on Rainbow Six Siege from the left pane.
It’ll automatically search for the available update.
If there is an update available, make sure to click on Update.
The process may take some time > Once done, close the Steam client.
Finally, reboot your PC to apply changes, and then try launching the game again.

For Ubisoft Connect:

Open Ubisoft Connect (Uplay) on your computer > Log in to your Ubisoft account.
Click on the Menu icon > Go to Settings.
Click on Downloads from the left pane > Check the Enable automatic game updates checkbox to enable it.

For Epic Games:

Open the Epic Games Launcher > Head over to Library.
Now, click on the three dots icon of Rainbow Six Siege.
Make sure the Auto Update option is turned on.

4. Verify and Repair the Game Files

In case, there is an issue with the installed game files on the directory and somehow it gets corrupted or missing then repairing the game files will be useful. Thankfully, most of the game clients do the job for you in an easy way.

For Steam:

Launch Steam > Click on Library.
Right-click on Rainbow Six Siege from the list of installed games.
Now, click on Properties > Go to Local Files.

Click on Verify Integrity of Game Files.
You’ll have to wait for the process until it gets completed.
Once done, just restart your computer.

For Ubisoft Connect:

Open the Ubisoft Connect software on the PC.
Click on the Games tab > Select the Rainbow Six Extraction game tile.
Now, select the arrow icon on the bottom right side.
A drop-down menu will appear > Click on Verify files.
If prompted, click on Repair.
Wait for the repair process to get completed.
Then reboot the PC to apply changes.

For Epic Games:

Open the Epic Games Launcher > Click on Library.
Click on the three-dots icon of Rainbow Six Siege.
Now, click on Verify and it’ll start verifying the game files.
Wait for the process to complete and restart the launcher.

5. Allow Ubisoft Connect and RSS in Windows Firewall

You can try whitelisting the Rainbow Six Siege program and the Ubisoft Connect application in the Windows Firewall protection by following the steps below to avoid game launching or achievement synchronization issues.

Open the Start menu > Search for Control Panel and open it.
Go to Systems and Security > Open Windows Firewall.
Select Allow an app or feature through Windows Firewall.
Now, click on Change settings > Select Allow another app.
Select Browse > Click to select Rainbow Six Siege.
Click on Add and make sure to save changes.
Next, make sure to add Ubisoft Connect in the same way.
Finally, save the changes, and reboot the PC.

6. Close Ubisoft Connect Process in Task Manager

Another thing you can do is simply close the specific Ubisoft Connect task from the system to ensure there is no additional consumption of system resources happening in the background whatsoever. To do so:

Press the Ctrl+Shift+Esc keys to open Task Manager.
Click on the Processes tab > Select the Ubisoft Connect task that you want to close.
Once selected, click on End Task.
Make sure to do the same step for other third-party unnecessary tasks individually. [don’t mess with system tasks]
Once done, restart your PC to change the effects immediately.

7. Delete App Data Files from Ubisoft Connect Directory

You should also simply delete the AppData folder/file from the Ubisoft Connect directory on the PC by following the steps below. It’ll eventually resolve the synchronization failed error in the Ubisoft Connect application.

Open File Explorer (This PC) > Head over to the installed Ubisoft Connect directory.
- The location should be C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher.
Now, right-click on the UbisoftConnect.exe file.
Select Properties > Click on the Compatibility tab.
Then click on the Run this program as an administrator checkbox to select it.
Click on Apply and then OK to save changes.
Make sure to do the same steps for the ‘webcore.exe’ file too. [if available]

8. Check the Internet Connection

Make sure to check your internet connection before jumping to any other conclusion because a poor or unstable internet connection can trigger many issues with the game launching or connecting to the game servers online. Try switching your wired (ethernet) connection to Wi-Fi (wireless) or vice versa, and then check for the networking issue again. You can also increase the internet speed by upgrading your data plan (if required) or contacting your service provider to assign a new IP address.

9. Try Using Google DNS

It seems that somehow your specific DNS address is having some blocking issues with the Rainbow Six Siege game server. So, you should try using the public DNS address on the PC or router manually adding DNS server addresses which will let you connect and synchronize the game servers easily.

Press the Win+R keys to open the Run dialogue box.
Now, type ncpa.cpl and hit Enter to open Network Connections.
Double-click on the Wi-Fi or Ethernet network from the list.
Click on Properties > Double-click on Internet Protocol Version 4 (TCP/IPv4).

Click to select Use the following DNS server addresses.
Next, enter 8.8.8.8 for the Preferred DNS server and 8.8.4.4 for the Alternate DNS server.
Once done, click on OK to save changes.
Make sure to restart your computer to apply changes.

That’s it, guys. We assume this guide was helpful to you. For further queries, you can comment below.