I registered a LDAP SERVER in EPO 4.5 (test connection was OK) but it does not recovery any information
What information do you want to recover?
Users, Gropus, Systems
Did you deploy McAfee ePO agents to your PC's?
Yes, but i have the message "Agent failed to communicate with EPO server" in all Pcs
Then you have ePO misconfiguration. Nothing to do with EEPC, please check in ePO forums how to troubleshoot agent issues.