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Error message when users visit a Web site that is hosted on a server that is running Internet Information Services 7.0: "HTTP Error 404.3 - Not Found"

Article ID: 942032 - View products that this article applies to.

SYMPTOMS

Consider the following scenario. You have a Web site that is hosted on a server that is running Internet Information Services (IIS) 7.0. When users visit this Web site, the users receive the following error message:

Server Error in Application "<application name>"
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HTTP Error 404.3 - Not Found
HRESULT: 0x80070032
Description of HRESULT: The page you are requesting cannot be served because of the Multipurpose Internet Mail Extensions (MIME) map policy that is configured on the Web server. The page you requested has a file name extension that is not recognized, and is not allowed.

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CAUSE

This problem occurs if the following conditions are true:

The handler mapping for the requested file name extension is not configured.
The appropriate MIME type is not configured for the Web site or for the application.

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RESOLUTION

To resolve this problem, follow these steps:

Configure a handler mapping for the requested file name extension. To do this, follow these steps:
1. Click Start, type inetmgr in the Start Search box, and then click Inetmgr in the Programs list.
  
  If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
2. In IIS Manager, expand the server, expand Web sites, and then click the Web site that you want to modify.
3. In Features View, double-click Handler Mappings.
4. Configure an appropriate handler mapping for the type of the requested file name extension.
Configure an appropriate MIME type for the Web site. To do this, follow these steps:
1. Click Start, type inetmgr in the Start Search box, and then click Inetmgr in the Programs list.
  
  If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
2. In IIS Manager, expand the server, expand Web sites, and then click the Web site that you want to modify.
3. In Features View, double-click MIME Types.
4. In the Action pane, click Add.
5. Add the extension of the required file and the MIME type in the Add MIME Type box, and then click OK.