How To Fix WordPress: “Briefly unavailable for scheduled maintenance. Check back in a minute.”

After some upgrade work on WordPress sites, sometimes the following message appears:
“Briefly unavailable for scheduled maintenance. Check back in a minute.”

This problem is caused by a failed automatic update on one or more parts of the WordPress site or an interrupted update process.
In fact, when WordPress is automatically updating the core WordPress files, plugins or themes, the site is marked as under maintenance.

The fix is fairly simple: in the root of WordPress installation simply delete .maintenance (hidden) file and the site will come magically back.


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