Just to be sure you do have different SSL VPN Pool network subnets on both sites do you?
So be sure not both sites are using the "default" 10.242.2.0/24 network. Otherwise the return traffic will never go back.
Also please give us a better layout view of your network. Are sites 1 and 2 both UTM's and do those UTM's connect to each other as a RED client/server pair or is there a standalone RED somewhere in the picture?
Managing several Sophos firewalls both at work and at some home locations, dedicated to continuously improve IT-security and feeling well helping others with their IT-security challenges.
Thanks a lot for your answers!
I solved the problem, by replacing the RED VPN Tunnel (between SG230 and XG230) with an IPSec Site to Site connection.
Now everything is fine!
Hallo Julian,
For others that come by here, the "trick" that it sounds like you used was How to allow remote access users to reach another site via a Site-to-Site Tunnel.
Using a RED tunnel should have worked with the necessary Static Routes on one or both sides.
Cheers - Bob