When a mass upgrade fails, or is aborted you will be seing the “maintenance mode” on the frontend and the backend (wp-admin)
[b:60d165d206]Solution:[/b:60d165d206]
[quote:60d165d206]Try deleting the file called “.maintenance” in the root of the site’s web folder.
That should disable the maintenance mode.
[/quote:60d165d206]
[b:60d165d206]Found:[/b:60d165d206]
http://wordpress.org/support/topic/30-stuck-in-maintenance-mode-after-failed-plugin-upgrade#post-1557350
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