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Advanced Custom Fields 5 – Could not connect to update server

Running Advanced Custom Fields 5 Pro for WordPress and getting the “Error. Could not connect to update server” message? Make sure your firewall can access connect.advancedcustomfields.com (for example, if you are running Bytemark’s Symbiosis software, add that to /etc/symbiosis/firewall/outgoing.d/50-reject-www-data