Unable to get traffic on VLan

Hi There,

I'm having some issues configuring the networking in one of our customers.

We need to deploy a virtual Panda Gatefender.

Attached is a schema of the configuration and VLans created.

The issue is that in VLan 31, all works Ok, the traffic arrives to the appliance, but in the interface attached to the VLan 100, no traphic  arrives.

The configuration is practically the same in both port groups.

Have you get some similar issue? Can you help me?

Thanks in advanced and regards.