To review the configuration, you set:
The first option ensures that you get the links to the articles which have the "access level=registered", and that they show in blogs and category lists.
The second, sets the article's access level as Registered.
This is fine. But in order for Joomla to be able to show the articles in blogs, the introText of the article needs to be visible to all as well. Here comes the trick.
Just add a "Read more" tag (with the button at the bottom of the editor) in the article; the text after the tag will be hidden. The first part of the article needs to be visible to all, otherwise neither Joomla (nor search engines) would be able to show it.
So just add the read more tag... it's that easy. If you don't want any text showing you can start the article with it, but it's against your interest.
I believe the problem he's having (and which I can see) is that the RSS feed is showing the entire article.
I just re-tested and I could only see the introtext both in the website and in the rss feed, hence I guess he's just missing the readmore tag. He might have a template override of the rss feed which is querying the database directly to show the full text, but that's fairly unlikely.
Yes, unauthorized links are set to be visible, and the article view option is set to be registered. The articles that I want to be visible only to registered users do not have any "intro" text that should be public--that would be counterproductive, especially as there is no blog for that category. It seems pretty silly to me that the "Read More" link should be a solution here--but I will try it.
readmore works in a strange way: upon saving, Joomla will store the portion of the text before the readmore in the introtext column, and the rest in the fulltext; the latter is the one that will be shown to registered users; in the introtext you may put a statement and a link to your registration page; and use the article configuration to prevent showing the introtext in the full article. This should give you enough flexibility.
Thanks for that explanation. I haven't tested this yet... Got a bit distracted with RL stuff. But if it works out the way I need I'll return to update.