Have I read the related troubleshooter articles above before posting (which pages?)? Yes
Have I searched the tickets before posting? Yes
Have I read the documentation before posting (which pages?)? Yes
Joomla! version: 2.5.9
PHP version: 5.3.22
MySQL version: 5.1.66-cll
Host: (optional, but it helps us help you) 5quidhost
Admin Tools version: attempted install of update to 2.5.3
On install of this upgrade to admin tools, attempting to access admin tools from the back end gives a Err 310 failure.