I put my forum into maintenance mode and now i can't access the admin area. How do i reverse this?
You can edit settings.php
Find
$maintenance = 1;
Replace with
$maintenance = 0;
Alternately you can use a tool like repair_settings.php to undo it. What is repair_settings.php? (http://www.simplemachines.org/community/index.php?topic=18096.0)