There are three specific Ports that must be open for the user's Cloud Node to work:
and UDP 123
Having these three ports open creates the VPN (Virtual Private Network) between your Cloud Node and the pdk server.
TCP Port 443 - This is the standard TCP port used for websites that use SSL (Secure Socket Layer).
UDP Port 53 - Uses the Datagram communications protocol for the Internet network layer, transport layer, and session layer. When used over Port 53, this User Datagram Protocol makes possible the transmission of a datagram message from one computer to an application running on another computer.
UDP Port 123 - May use a defined protocol to communicate depending on the application. (A protocol is a set of formalized rules that explains how data is communicated over a network.)