This morning I had a couple of users get "Access Denied" warning messages when trying to access a shared folder on my Win2k3 server. They had not previously had problems accessing the folder and no permissions were changed. I restarted one of the machines, logged back in and had the same problem. I then shut it down, left it down for 15-30 seconds and restarted it. Logged in and viola, no more "Access Denied". Has anyone run into this sort of problem before? Is there a possible security breach somewhere causing this?