WordPress Update Failed or Stuck in Maintenance Mode: Fix

What this problem is

You see a maintenance message, or updates fail and WordPress does not complete the process.

Why it happens

• An update was interrupted (timeout, lost connection)
• File permissions prevent writing new files
• Not enough disk space

Prerequisites

• FTP or File Manager access
• Backup (recommended)

Diagnosis

1. Check if the file .maintenance exists in the WordPress root folder.
2. Review disk space and file permissions.
3. Check if a plugin/theme update is partially applied.

Step-by-step (detailed)

1. Delete the .maintenance file (if present).
2. Ensure correct permissions (typical: folders 755, files 644).
3. Retry the update from wp-admin.
4. If it still fails, update manually by uploading fresh files for the theme/plugin.

Expected results

• Maintenance message disappears
• Updates complete successfully

What to do if it fails

• If permissions are correct but it fails, check disk space and PHP limits.
• Disable security plugins temporarily if they block file writes.
• Use staging to test updates if the site is business-critical.

Best practices

• Do updates during low-traffic windows.
• Keep backups and rollback plan.
• Use managed updates or staging for major upgrades.