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PHP FPM Unix Socket Error 13 Permission Denied After Updating Ubuntu

If you have a Ubuntu web server (running Ubuntu 14.04 LTS, 13.10, 12.04 LTS, or 10.04 LTS) set up using PHP FPM with Unix sockets, be warned that a recent security patch that fixes an issue with the PHP FPM socket permissions, may also break existing configurations, preventing your website from load php files. After this patch gets installed, you may find your unix socket now no longer accepts connections from your web server user, and you will see an…

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