This happens:

Bad request
The page that you are looking for might have been removed, had its name changed, had its content expired, or is temporarily unavailable.
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Please try the following:

•Make sure that the Web site address displayed in the address bar of your browser is spelled and formatted correctly.
•If you reached this page by clicking a link, contact the Web site administrator to alert them that the link is incorrectly formatted.
•Click the Back button or open the home page for this Web site and look for other links to the information that you want.
HTTP Error 400 - Request is badly formed.
Internet Information Services (IIS)

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Technical Information (for support personnel)

•Go to Microsoft Product Support Services and perform a title search for the words HTTP and 400.
•Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled Web Site Setup, Web Site Administration, and About Custom Error Messages.