We recently faced a issue with our SharePoint Internet Portal. The Site was published on Internet, but when browsed on Mobile phones, especially Iphone. Whenever you browsed the portal through a mobile device, its throws the authentication window, where you need to provide user id and password.
By default, making a site in SharePoint anonymous not works for mobile users.
So to making anonymous for mobile, the easiest way to open the compat browser config file, and make the “IsMobileDevice” entry false.
Making this false, will provide the anonymous access to the mobile users, and open the standard site (same internet site).
You can find the config file at “C:\inetpub\wwwroot\wss\VirtualDirectories\80\App_Browsers\compat.browse”
You will see lot of entries for each mobile & other browsers





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