RSS Viewer web part bug

If you want to use RSS Viewer web part for private/authenticated feed, you need enable Sharepoint Kerberos authentication. Otherwise you get error: "The RSS webpart does not support authenticated feeds" even the feed from its own site.(update 03/31/2010:

• on window 2008, it can view authenticated feeds from its own site, but it is win2k8 only. on both window 2003 and window 2008 R2, it requires SPN registration (delegation not necessary) and Kerberos in order to view authenticated feeds;
• if both feeds and RSS Viewer on the same server, only consuming web application (RSS Viewer host) needs Kerberos even if feeds are from other web application with different application pool;(on window 2008, it only requires IIS kerberos setting, no SPN needed)
• the above apply for both moss and sharepoint 2010;

When you view a private feed, you may also get the following error:

"An unexpected error occured processing your request. Check the logs for details and correct the problem."


It happens when you use a non-default zone URL for sharepoint site: (update 03/31/2010: this appears not to happen on sharepoint 2010 beta2)



With AAM setting like this:






It works if using the default zone URL:
(update 03/31/2010) Reference: SharePoint 2010 and Kerberos by Spence Harbar