The connection issue can be blamed not only on the game itself but also on some external factors.
This operation will help to fix most temporary errors from the old cookies and cache.
Heres how to do it:
Step 1.

Right-hit thetaskbarto openTask Manager.
Under theProcessestab, right-click onSix Rainbow Siegeand chooseEnd task.
Go to theUbisoft Websiteto peek if the server is down at the moment.
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If the server status is fine, just move to the next solution.
Why is my Internet so slow?
In this case, clearing the DNS cache might be a good option for you.

Typecmdand hitEnterto openCommand Prompt.
Therefore, you are supposed to disable all the background apps.
Right-select thetaskbarto chooseTask Manager.

In this case, you could verify the integrity of game files via the Steam client.
Heres how to do it:
Step 1.
FindRainbow Six Siegein the game library and right-choose the game to chooseProperties.

Under theLOCAL FILEStab, hitVERIFY INTEGRITY OF GAME FILES.
With game sizes ever increasing, it is taking longer and longer to download games.
If you meet Steam not downloading at full speed, look through this post now!
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