PPBE can only find devices within the same subnet. If your computer is on a different subnet than that of the UPS you want to connect to, then you have to change the IP address of your computer to be on the same subnet as the UPS or vice versa.
Yes, the following network service ports should not be blocked by firewalls where PPBE is installed:
Yes, the Secret Phrase of all computers running PPBE and RMCARDs needs to be the same for communication to be established. This is set up under Security>Authentication.
Use Agent when you are connecting the computer to the UPS with a USB or Serial cable. Use Client if you are connecting the computer via your network to the RMCARD installed on the UPS. Use Center when you want to monitor and manage all the CyberPower power protection products on your network.
No, you can only install one role of PPBE on a computer.
RMCARDs can manage up to 50 PPBE Clients.
There is no limit to the number of PPBE Clients a PPBE Agent can support.
There is no limit to the number of devices PPBE Center can support.