Running Gravity Forms for WordPress and getting invalid license key/licence key or unable to update? Make sure your firewall can access www.gravityhelp.com , proxy.gravityplugins.com and s3.amazonaws.com [ which holds the update files] (for example, if you are running Bytemark’s Symbiosis software, add that to /etc/symbiosis/firewall/outgoing.d/50-reject-www-data