Reading your answer I realized that I have a mistake in my first post. The used port number by agents version 4.5 is 443, not 8443.
What I can understand from https://kc.mcafee.com/corporate/index?page=content&id=KB66797 is that if all my agents are 4.5 I don't need port 80 because the communication between server and agents is made using port 443.
¿It's right my assumption?
Thx in advance.
That's correct :)