blocks

Hi, New to Drupal and have a question. I am rebuilding my website from HTML, Javascript, CSS, and so on coding to Drupal and also using it for Drupal learning. I have a block that I want to be displayed on all nodes/pages of the site except for the following; front, contact and forum only when an anonymous user/visitor is on the site. The block does not display on the front page and that is correct. However no matter what I place the “Show block on specific pages except for those listed” the only page it does not show up on is the front page.