SharePoint 2010: The Web Server at URL Does Not Appear - TechNet Articles - United States (English) - TechNet Wiki

Recently one issue was reported to me where some of the administrators reported that they were unable to use SharePoint designer and while trying to open the sites they were getting the message "The Web server at URL does not appear to have Microsoft SharePoint Foundation installed".
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SharePoint 2010: The Web Server at URL Does Not Appear