Here's what I did,
Created an Azure Website (http://myapp1.azurewebsites.net) in Standard tier
Configured Azure Traffic Manager and added endpoint as an Azure endpoint. Trafficmanager routes to the website. Nice!
Removed the endpoint and and added endpoint as an External endpoint. Trafficmanager routes to a 404 page. I provided the FQDN (Fully Qualified domain name) as myapp1.azurewebsites.net.
What is wrong with it? Doesn't Azure allow to have .azurewebsites.net sites to define as endpoint urls?
Endpoint details, Status - Enabled Monitor Status - Degraded Type - External Endpoint
Complete error page details,
Error 404 - Web app not found.
The web app you have attempted to reach is not available in this Microsoft Azure App Service region. This could be due to one of several reasons:
1. The web app owner has registered a custom domain to point to the Microsoft Azure App Service, but has not yet configured Azure to recognize it. Click here to read more.
2. The web app owner has moved the web app to a different region, but the DNS cache is still directing to the old IP Address that was used in the previous region. Click here to read more.
External endpoint needs to be outside Azure website.