I have just separated the main intranet site and my sites into a new web application. Since then, the RSS feed reader does not work properly. I tried to install it again, but it says that it is already installed. The Feed Reader web part does not show up if I try to add a web part to a my site page and existing web parts have an error
http://rssfeedurl does not appear to be a valid RSS feed. If the feed is valid, please ensure your proxy server settings are correct if you use a proxy server.
Error returned from FeedReader: The remote server returned an error: (403) Forbidden.:SmilingGoat.Syndication
Do I need to reregister the web part somehow?