See 
http://www.xwiki.org/xwiki/bin/view/FAQ/PrivateRssFeeds
Thanks
-Vincent
On Mar 5, 2008, at 8:53 AM, [Ricardo Rodriguez] Your EPEC Network ICT
Team wrote:
  Hi all,
 I've been playing for a while with the new cool BulletinBoard
 application. Please, is it possible to access RSS feeds for restricted
 access boards?
 I am doubting if this is a matter of the RSS client, XWiki feed URL
 format or XWiki been/not been able to accept basic authentication
 (or at
 least username and password not being able to be sent in the URL
 string)
 a combination of these issues or anything else.
 The point here is that we do need to restrict this access to a given
 board but at the same time RSS it is quite useful. Of course Watch
 could
 be an option.
 Any tip will be welcome! Thanks!
 Cheers,
 --
 Ricardo RodrÃguez
 Your EPEC Network ICT Team