No application was found at the web address: [URL]

The following error occurs when trying to run the installable cloud app for the first time.

No application was found at the web address: [URL].

Cause 1 & solution:

The client app has not been deployed to the server. Please deploy the application to the target server.

Cause 2 & solution:

Another service is already running at the same host and port, which causes the client app service to fail to run. Please stop the other service.

Cause 3 & solution:

The client app URL has been blocked from access, due to the IIS request-filter settings. Please follow the instructions in this web page to make sure the app URL is not blocked.