---
title: "Error message-“The page you are requesting cannot be served because of the extension configuration.”"  
description: "Error message-“The page you are requesting cannot be served because of the extension configuration.”"  
author: "Anonymous User"  
published: 2015-05-01  
updated: 2015-05-01  
canonical: https://www.mindstick.com/forum/23174/error-message-the-page-you-are-requesting-cannot-be-served-because-of-the-extension-configuration  
category: "asp.net"  
tags: ["asp.net", "iis"]  
reading_time: 1 minute  

---

# Error message-“The page you are requesting cannot be served because of the extension configuration.”

this is the [error message](https://www.mindstick.com/forum/160670/how-to-add-custom-validation-with-error-message-in-knockout-js-form-validation) i am getting when [trying](https://answers.mindstick.com/qa/93698/6-mistakes-couples-are-trying-to-save-money) to run my application. I don't know how to fix it:\
[HTTP Error](https://www.mindstick.com/forum/33552/error-code-0x80070021-and-http-error-500-19) 404.3 - Not Found The [page](https://www.mindstick.com/articles/13031/why-to-make-a-wikipedia-page) you are requesting cannot be served because of the [extension](https://www.mindstick.com/articles/22/extension-method) configuration. If the page is a [script](https://www.mindstick.com/interview/477/how-can-i-execute-a-php-script-using-command-line), add a handler. If the [file](https://www.mindstick.com/articles/59/encrypting-and-decrypting-files-using-c-sharp) should be downloaded, add a MIME map.\
Here's a screenshot of the error page: ![Error message-“The page you are requesting cannot be served because of the extension configuration.”](https://www.mindstick.com/mindstickforums/f24dfd1c-0a88-40ea-ad0b-b7720eb2378a/images/78465aad-c447-476c-bac3-b6c06239124d.png)\
How can I fix this error?\

## Replies

### Reply by Anonymous User

Use [aspnet_regiis.exe](http://msdn.microsoft.com/en-us/library/k6h9cz8h%28VS.80%29.aspx) to register version of .NET framework you are using.

This is a common issue and happens when IIS is installed after VS or .NET framework.


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Original Source: https://www.mindstick.com/forum/23174/error-message-the-page-you-are-requesting-cannot-be-served-because-of-the-extension-configuration

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