HTTP error 413 - get and set uploadReadAheadSize in IIS

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In this post, I describe how to get and set uploadReadAheadSize in IIS to fix the error:

"An unknown error occurred while processing the request on the server. The status code returned from the server was: 413"

Screenshot showing error with status code 413

Cause

This error occurred after I created a self-signed SSL certificate and tried to access a site in IIS over HTTPS.

Error code 413 means "Request Entity Too Large".


Resolution

To resolve the issue, I increased the uploadReadAheadSize in IIS as follows:

- Open IIS

- Select your site in the treeview on the left

- Open Configuration Editor:

Screenshot of Configuration Editor in IIS

- Open the Section drop down, expand system.webServer then select serverRuntime:

Screenshot showing serverRuntime in IIS

- Here you can check your current uploadReadAheadSize and set a new value in bytes between 0 and 2147483647 (more information from Microsoft)

Screenshot of uploadReadAheadSize in IIS

- Click outside uploadReadAheadSize then press Apply in the top right to save your changes

Error 413 should now be resolved.


Related Posts

- NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM - IIS SSL Certificate

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