Problem between OPNsense and Google Load Blancers

[clopmz]

Hi all,

I have installed two OPNsense fws as a virtual machines in GCP. All it is working ok, except when I try to configure an external load balancer to use these fws in HA mode due to the impossibility to configure CARP in cloud providers.

I have configured this external load balancer to accomplish health-checks against OPNsense's web interface but always load balancer returns "timeout" and backend pools appears down (backends are OPNsense fws). I have configured rules in WAN interface to allow access from Google's health-check networks: 35.191.0.0/16,209.85.152.0/22,209.85.204.0/22 ... and nothing ... always is a timeout.

Due to this problem, I have installed an ubuntu vm with a nginx server to check my load balancer config and it works.

Arrived to this point I am completely lost ... Any ideas? What am I doing wrong?

[clopmz]

Please, any help?