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There are many problems that makes a dublicate page: 1. www resolve (domain with www and domain without www, search engines see tem as 2 websites and consideres dublicate content) 2. Parameters used in sending them with get method between pages ex : "?pageId=12&userid=566" here you will use canonical links or exclude them from webmastertools or use robots to block the access to these pages 3. When you use filters or search querys, combobox, dropdown menu, theese components are using get method if there is not specified in form one. 4. I sow your site and you have there many Telerik.Web.UI.RadComboBox -> here is your problem see how you manage their parameters and how the forms are validated and how page is loaded canonical tag may be your sollution generally :)