Node can't join cloud-init datasource after enabling SSL

Hello everyone,

We just enabled SSL on our MaaS server but since our nodes can’t join cloud-init database while rebooting.
They are trying to join MaaS on port 5240 that we blocked with iptables.

We used this documentation :
And we want to enforce that SSL is used.

Where can we setup cloud-init to connect directly via https on port 443 ?

Thank you,