Activation Fails - Communications Problems (Mac OSX Only)

In some network configuration, when attempting to activate Vectorworks, you may encounter this error message:

This is primarily caused by a Proxy server or a Firewall, either locally or on your network. 

However, in some instances, going to Apple > System Preferences > Network > Ethernet (Or AirPort, normally) > Advanced > Proxies and unchecking the option for "Use Passive FTP Mode (PASV)" will resolve the issue:

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