Configured a site-to-site IPSec tunnel between OPNsense and Linux. OPNsense is the initiator.
When some interruption occur between, OPNsense don't get online.
Need to restart IPSec.
I've noted the same between a freebsd firewall opnsense. After a restart of the opnsense firewall, might be after an update, I have to use other ways of connecting to the network and then restart VPN service to connect.