We have some customers calling our api via and Azure Application Gateway from AS-400 and other older systems that do not provide a hostname in their request. I have a basic listener set up and it should handle these requests, but it doesn’t. In the AGWAccessLogs I see that the gateway sets OriginalHost to ~^subdomain.sitename.com$ using the hostname from my highest priority rule and returns a 400. No rule is processed. I think this worked on my older gateway, but after I replaced it with a new gateway, I realized it doesn’t work there. Has anyone dealt with this issue before?