Users of our SharePoint site have been experiencing random Access Denied messages, even though they have been given permission to access it (either expressly or as a member of an AD group). When the user clicks the "go back to site" link, or if they hit the back button and try to access again, they are able to access the site fine for a while.
Other Observations: This typically seems to happen the first time they access a site for the day or if they have not accessed the site for awhile (few hours?), and it does not seem to happen at the main site (typically only sub-sites). The problem only seems to occur when a particular user has read access; it does NOT seem to occur with users who have full control (e.g. my account has never had a problem, and I am in site owner group of all sites). Also, the problem does not seem to change whether authentication is set for Kerberos or NTLM.
My symptoms are similar to the question at http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/MS-SharePoint/Q_23953683.html
, however the solution does not seem applicable because I am in a single-server environment.
SQL Server back-end