Clear Maintenance Mode to Unlock a Site Collection in SharePoint

Problem: Another fine morning, SharePoint 2013 sites started displaying a message: "We apologize for any inconvenience, but we've made the site read only while we're making some improvements.". Same time, noticed a backup failure E-mail from the backup software!
sharepoint 2013 remove maintenance mode

Root Cause:
Since the Backup failure occurred, SharePoint placed the site to read-only mode. However, all options under "Site Collection Quotas and Locks" were disabled in SharePoint 2013 Central Administration site!

Solution: Clear maintenance mode using PowerShell
This is because, SharePoint site collection is set under maintenance mode. To clear maintenance mode in SharePoint, use this PowerShell script:
Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Site Collection URL
$SiteURL = ""

#Clear Maintenance mode
$Admin = new-object Microsoft.SharePoint.Administration.SPSiteAdministration($SiteURL)
This removes maintenance mode in SharePoint 2013. Read more about SharePoint 2013 Maintenance Window Notifications


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