HTTP Error 503 The service is unavailable

This is one of HTTP type (400,500,..)of error responses send by IIS to client (Browser) for any IIS or web server error. There is various type of HTTP (Hyper Text Transfer Protocol) web response used by IIS for HTTP web request. Depends upon the request processing by w3c process IIS send corresponding response code to the client (web Browser).

"HTTP Error 503. The service is unavailable." Response return by IIS in one of the following scenarios.
1. If Application pool used by the website stopped due to some internal crash or unhandled exception encountered.

2. If website

To fix this problem you need to restart the application pool which is used by the website and once application pool started refresh website (select website in Default website tree and right click then select Refresh)

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