I have articles where only a joomla group has access.

the title and intro is shown and when you click to view more, you will need to login. However, on clicking on the document again you are directed to logout page.

I have been puzzling on this issue for some time now, can anyone guide me.

Thank you.

You could try this solution here:

getk2.org/community/New-to-K2-Ask-here-first/185294-login-required-to-read-more#185360