So this box is in a DMZ to a firewall in the 192.168.19.0/24 network?
no it’s nated behind a firewall, firewall has many public IP addresses nated to internal hosts
Let’s see if anybody else can help you out here. My best guess is is that there is an issue with the NATTING for on NS side it looks ok without the vlan.
Sorry I can not help you better atm.