OK, I have a question regarding the ports for ZLM. Please do NOT refer me to the documentation as I've read it but it does not specify if the traffic needs to be bi-directional or just one way (either from client to server or server to client). The two ports that I have questions about are 2544 and 8089. Specifically, do we need to allow 2544 and 8089 from the clients to the server only, have the ports open both ways or just need communication from the server to the clients on those ports?