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I want to change the Authentication Provider from Kerberos to Claim-Based in my SharePoint 2010 Enterprise Edition environment.
What problems can occur in my SharePoint environment? I heard that there are problems with the RSS Reader Webpart if the Webpart consumed a feed from my SharePoint. It will probably not be usable with Claim-Based Authentication. Are there other problems like this?
You mean that you want to change from classic authentication to claims-based authentication. Claims-based authentication also supports Kerberos (as well as NTLM). Therefore, you shouldn't encounter the double-hop problem with your RSS reader webpart if you set things up correctly.
I've been using claims-based authentication (Kerberos) for a while now and haven't encountered any problems. On the other hand... I haven't used the RSS Reader web part yet.