After the records for your domain name have propagated, you should be able to use your browser to verify that your custom domain name can be used to access your web app in Azure App Service.
Note
It can take some time for your CNAME to propagate through the DNS system. You can use a service such as http://www.digwebinterface.com/ to verify that the CNAME is available.
If you have not already added your web app as a Traffic Manager endpoint, you must do this before name resolution will work, as the custom domain name routes to Traffic Manager. Traffic Manager then routes to your web app. Use the information in Add or Delete Endpoints to add your web app as an endpoint in your Traffic Manager profile.
Note
If your web app is not listed when adding an endpoint, verify that it is configured for Standard App Service plan mode. You must use Standard mode for your web app in order to work with Traffic Manager.
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In your browser, open the Azure Portal.
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In the Web Apps tab, click the name of your web app, select Settings, and then select Custom domains
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In the Custom domains blade, click Add hostname.
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Use the Hostname text boxes to enter the Traffic Manager domain name to associate with this web app.
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Click Validate to save the domain name configuration.
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Upon clicking Validate Azure will kick off Domain Verification workflow. This will check for Domain ownership as well as Hostname availability and report success or detailed error with prescriptive guidence on how to fix the error.
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Upon successful validation Add hostname button will become active and you will be able to the assign hostname. Now navigate to your custom domain name in a browser. You should now see your app running using your custom domain name.
Once configuration has completed, the custom domain name will be listed in the domain names section of your web app.
At this point, you should be able to enter the Traffic Manager domain name name in your browser and see that it successfully takes you to your web app.