Additions to this Web site have been blocked - error message when you check user permissions

I came across this issue a few days ago where all users with Full Control privileges seemed to have lost their elevated privileges on a specific site collection in a SharePoint 2010 farm. They were unable to add users to a group or make any kind of changes. It turned out that a site collection backup failed and it set a read-only lock on the site collection. After removing the lock everything went back to normal.

About the author

Hi! I'm Marcell Mikolcsó, SharePoint and Enterprise Administrator, System Architect.

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