pass authentication from Sharepoint to ASP.NET web app

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Our users with be logged into Sharepoint with Windows authentication, and from Sharepoint, click on a link to open an ASP.NET web app. I need make sure that the ASP.NET site is logged in via the Sharepoint session or cookies or token... I have read that turning on Windows Authentication on the IIS server would enable this action but I am not sure. Are there any good resources that would show me how to do this?

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So you need to implement SSO for Asp.net web app from SharePoint Website correct? When you say IIS Server do you have on premise setup for sharepoint. Which version of sharepoint do you have?

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2013. Yes, it is an on premises install.