Site to Site VPN combined with VPN client

[harrydeko]

Hi, I do not know if anyone has tried this or that I'm implementing this wrong;

I have a customer with 2 sites with 2 Fortigates, connected with a site-to-site IPSec VPN connection.

At the office:

At site A i have a Domain Controller, users can access data on site B, everyone at the office is happy

At site B i have a Domain Controller, users can access data on site A, everyone at the office is happy

Now users who are outside the buildings:

What we want is that a user connects remotely to site A (using the VPN Client on a Windows system) can access data at site B.

For now they disconnect site A and connect to site B, but can this be done without this step?

I hope you understand what I mean by this?

I've already searched these forums in hope to find anyone with the same setup but am not able to find any cases..

[gogomarkni]

several years later, has someone solve this issue?

I have one site to site vpn connected site A and site B.

and outside users use sslvpn  to connect site A and both side A and side B could be access well.

 but after fortigate update to 7.6, sslvpn feature was not support.

I change to use forticlient (with ipsec) to replace sslpvn, but similar to above situation, the forticlient only can access site A and cannot to site B, even I add static route and firewall policies on both fortigate firewall.    

[Paz]

Yes, I was having the same problems. But I have managed to solve the issue today. 
This website was perfect:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Dialup-IPsec-traffic-forwarding-to-site-to...