Disconnections IPSec - Comming from zero problems with SSL VPN

Hi,

we are changing from SSL VPN to IPsec since our FG90G doesnt support in the next OS the SSl VPN.

Right now we are testing with the IT department and I got feedback that the client closes the connection after x minutes, something that with SSL VPN never happened before.

We are using unlicensed FortiClient, I dont know if we have option on the client with ALWAYS UP. Is there something we can change on the Remote IPSec configuration on the FG90, maybe Dead Peer Detection? We set it up with the wizzard.

Thanks!