[2021] Cant connect to friend's lobby and can't invite

To verify your Uplay game files for Rainbow 6 Siege, see the image below!




Here are some workarounds for potential issues connecting to squad members:
- First of all, make sure that all squad invites from the party leader are being sent from the squad menu, not the Uplay overlay party menu. You have to ACCEPT from the overlay party menu, but do no initiate from there.

- Secondly, just to be safe, make sure that a squad invite has been accepted before you send the next one. Sometimes if several squad invites are sent out at once, it can break the party.

- Thirdly, make sure that only the party leader starts the game search. If someone other than the party leader initiates the game search, it can end up kicking the leader out of the party.

- Finally, check to be sure that you aren't mixing NAT types if you are on PC. You can see this in the upper right hand corner of the menu. NAT types should be the same across the party (Open, Strict, Moderate). Having one player with open NAT type, and another with strict NAT type, will result in an error.


If the steps above do not assist with the issues you're experiencing, please contact our Ubisoft Support with the following information:

You location:
Your ISP:
Are you on a shared, campus or military network:


Thank you!
http://support.ubi.com

Originally Posted by HLWTactics
And seconly,when we see the NAt type is different,how to fix it?Just restart the game or how?

- Port Forwarding
If it is not possible to shut-down your firewall you will need to configure your router and/or firewall to forward the following network ports:

Uplay
TCP: 80, 443, 13000, 13005, 13200, 14000, 14001, 14008
R6: Siege
UDP: 10000-10099, 3074, 3658
TCP: 80, 443

(directions for configuring network ports are specific to the software and hardware being used, and can be found by visiting the manufacturer's website. Websites such as http://www.portforward.com offer tutorials on how to open ports on your router.)