Clear Maintenance Mode to Unlock a Site Collection in SharePoint

Problem: Another fine morning, SharePoint 2013/2016 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, I noticed a backup failure E-mail from the backup software! Root Cause:Since the Backup failure occurred, SharePoint placed the site in read-only mode….

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