We need the AppGw supports SNI for multiple end-to-end SSL sites(Different Certificate on backends)
We have configured multiple end-to-end SSL sites on AppGw with different certificate, but AppGw doesn't support SNI when probe or forwarding traffic to backend. As a result, we have to configure the same certificate for my all virtual hosts on the backend. Could you please add this SNI feature in the AppGw future version?
Sage McEnery commented
Agreed. this is proving to be a problem in our setup as well. We have two VMs in our backend pool running 2 sites in IIS. Each site is configured with an SSL binding. If any of the SSL Bindings have the Require Server Name Identification checkbox enabled, the Application Gateway shows them as failed in the Backend Health blade.