My site is stuck in maintenance mode.

Sometimes Moodle gets stuck in maintenance mode and you'll see the message "This site is undergoing maintenance and is currently unavailable" despite your attempts to turn-off maintenance mode. When you put Moodle into maintenance mode it creates a file called maintenance.html in moodledata/1/maintenance.html (the site files folder). To fix this try the following:

• Check that the web server user has write permissions to the moodledata folder.
• Manually delete the maintenance.html file.