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Difference between Classic and Claim based Authentication in SharePoint 2010

In this post we will discuss about what is difference between Classic and Claim based Authentication in SharePoint 2010. Also you can check out posts on:

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– Different Authentication mechanism in SharePoint 2010

– Enable Anonymous Access in SharePoint 2010

– LINQ to SharePoint 2010

Classic Based Authentication :
You cannot configure the Forms based authentication if your web application is using Classic Mode Authentication.

You can convert a web application from Classic Mode Authentication to Claims Based Authentication. However, that can only be done using PowerShell commands and its an irreversible process.

Classic authentication supports authentication types like Kerberos, NTLM, anonymous. Classic is more commonly seen in 2007 environments.

Claim Based Authentication:
It enables authentication from windows as well as non-windows based systems. This also provides the capability to have multiple authentication in a single URL.

Claims based authentication uses claims identities against a against a trusted identity provider.

Claims are the recommended path for new deployments in SharePoint 2010

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