Remote-homeassistant / Promox VM and Firewall?

Hello people of the world :slight_smile:

I am using remote-ha (VM Proxmox) to directly transmlit alarm to my main HA (green box). Things seems to work except when I am activating the f irewall of the proxmox for this VM … If activated, all devices are immediatly disconnected. If desactivated, all devices are reconnected :slight_smile: What port number did I missed ?
Thx