Tier - Standard
SKU - Small
Both a public and private Frontend IP configuration are setup.
I first created a listener using the public Frontend IP and port 443 (HTTPS). I chose a listener type of Multi site and entered a host name. The listener created successfully.
Next, I attempted to created a listener using the private Frontend IP and port 443 (HTTPS). I chose a listener type of Multi site and entered a host name. The listener failed to create with an error:
"Failed to save configuration changes to application gateway. Error: Two Http Listeners of Application Gateway are using the same Frontend Port.
I was able to create additional listeners on the public Frontend IP using port 443 with a listener type of Multi site.
Is it a product limitation to not be able to create a public and private listener on the same port?