Azure – Web App DNS issue

Hello there!

I have been driving a project which most of the components are run on Azure as PaaS and others as IaaS. Due to a service dependency, we built a point to site vpn to connect our Apps to our Azure VNet, and a site to site vpn to connect our VM‘s to to our on-premise. So our Apps are able to communicate to our on-premise through the tunnels. Lastly, we defined a custom DNS server ip address which points to one of our dns servers that run  on our on-premise.

https://docs.microsoft.com/en-us/azure/app-service-web/web-sites-integrate-with-vnet

vnetint-howitworks

The custom dns setting inherits  the VM’s inside the VNet. But not for the App.

At this point, we ran into a problem.Although the custom dns server ip address was set and displayed in VNet integration blade, it didn’t effect our App!  After a short dialog with Azure Support we were provided a solution 🙂

vnet

As you can see above , we added a variable settings  under the Application Settings of our web app. The value, of course, points to our on-premise dns server. The support guy that helped us gave us a promise to update the documentation 🙂

Cheers,

Wish you great week:)

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