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500 ...errors in the 500-series indicate that the “backoffice” portion of a web application has failed. “500” itself means that some internal configuration error is preventing the web server from communicating with the backoffice. 503 ...means the backoffice service has stopped running (“is not available”). 502, 504 ...these errors indicate failures of communication between the web server and the backoffice software. They’re usually both still running, but can’t communicate to get the job done.
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Note: While 400-series errors are failures of the web server, 500-series errors are failures of the software “behind” the web server. |