By default Network Rendering is set up to Auto detect manager and workers/clients.
Worker and manager will just have to have the same port numbers specified in the Network Configurator and when you connect the Monitor you only need to keep the Auto-detect option checked, when you connect. You find the connection dialog in the Monitor menu File > Connection Settings...
On this page
Manually Connect to Manager
If Auto Detect is not enabled, or your network operates with Multiple Managers you can specify the Manager in the Connection Settings.
Disable Auto detect manager and fill in the manager hostname (or IP Address) as well as the port number.
How To Change The Port Numbers
The Default port numbers are
4807 to connect monitor and manager.
4808 to connect worker and manager.
We recommend keeping default port values. If you need to change the ports anyway you can do that in the Network Configurator. Make sure to change it on both Manager and Workers.