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IIS logs 500.19 if a client drops connection while loading the website

HTTP status and sub-status codes provide valuable information about the issues users come across. One of the code pairs is 500.19 which means “Configuration data is invalid“. However, IIS may show this pair incorrectly if a user drops connection before the browser loads the website completely.

The error message from the Failed Request Tracing log is below. Please note that this error appears during the execution of the Dynamic Compression module.

HttpStatus: 500

HttpReason: Internal Server Error

HttpSubStatus: 19

ErrorCode: An operation was attempted on a non existent network connection (0x800704cd)

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Error log when the client drops connection
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