HTTP Error 503 - Service unavailable

This type of error message comes when at any particular point of time, the web server which runs the website is not able to handle the HTTP request or the server does not agree with the socket connection. This arises due to temporary overloading or maintenance of the server. This is a temporary issue that usually gets fixed in a small time interval. This error is reported to return more often in IIS 6.0 as compared to the earlier versions. This error may also occur when the application pool is not started or enabled.

Error cycle:

I. Obtaining IP address of the site.

II. Opening an IP socket connection to that IP address

III Writing an HTTP data stream corresponding to that IP socket

IV Receiving an HTTP data stream from the web server in response

Fixing the error:

I. The web server can be closed temporarily for repair. The client accessing the site can expect that someone is looking after the issue and the usual services will resume soon.

II. The system operators of the website can be contacted. They will be able to help out the client in the best possible way.

III. Refresh/ reload the web page or type in the URL again or press Ctrl+F5.

IV. Restart the router and then the PC, especially if  Service Unavailable – DNS Failure error notification comes.

V. Come back later. It is also possible that many people accessing the site leave and then the page is made available to the new requests.


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