access denied when clicking on an item with read access

Problem: In SharePoint 2007, user sees a list on the home page, the list of items are pull from an ordinary list. User clicks on any item on that list and gets access denied. Checked that authenticated users indeed have read access.

Solution: In the permission level, checked the 'read' permission, make sure the 'view application pages' is checked.

User get access denied with Excel services

Even though trusted location was setup in excel services, with the trust children checked.

Turns out the there is a difference between http://url/ and http://url.com/ etc. Trusted location has to be config with both.