Transfer network between two virtual firewalls is beeing blocked

[clerint]

Hello everyone,

I'm new here and currently working with a Proxmox environment running on a UCS system.
I have one external VM and one internal VM, each located in a different firewall zone. However, I'm having trouble connecting the two firewalls communication between the zones doesn't work, and traffic seems to be blocked somewhere.
Does anyone know how to properly connect or configure these firewalls in Proxmox so that both zones can communicate without being blocked?

[viragomann]

So your created specific interfaces for the transfer network on both firewalls, you don't use WAN on either side?

Did you add proper routes on both?

Did you add firewall rules to allow communication?

[meyergru]

Just a quick reminder: OpnSense does not work right out of the box with Proxmox. See this: https://forum.opnsense.org/index.php?topic=44159.0