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Error message when you visit a Web site that is hosted on a server that is running Internet Information Services 7.0: "HTTP Error 404.10 - REQUEST_HEADER_TOO_LONG"

Article ID: 942077 - 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 a user visits this Web site, the user receives the following error message:

Server Error
--------------------------------------------------------------------------------
HTTP Error 404.10 - REQUEST_HEADER_TOO_LONG
HRESULT: 0
Description of HRESULT # The operation completed successfully.

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CAUSE

This problem occurs because the header limit option for the Request Filtering feature is configured for the Web server. The Request Filtering feature denies the request because the request header is too long.

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RESOLUTION

To resolve this problem, follow these steps:

Click Start. In the Start Search box, type notepad. In the Programs list, right-click Notepad, and then click Run as administrator.

If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
On the File menu, click Open, type %windir%\system32\inetsrv\config\applicationhost.config in the File name box, and then click Open.
In the ApplicationHost.config file, locate the <requestFiltering> element, and then locate the <headerLimits> element.
Change the value of the sizeLimit property to a smaller value.