Cannot access admin tool after changing session time out

[Heatherbell]

I hope someone can help us urgently. We cannot access or log in to the administration tool. This happened when we changed the session time out in admin/includes/sessions from 1440 to 14400. We do not know if this is a coincidence or not. We have changed the value back again but the problem persists. Many thanks

[Heatherbell]

Sorry we forgot to say that all we get is " explorer cannot display the webpage" - no error message or log in box

[RMD27]

Clearing the browser cache would be the first step. Also try another browser.