HP Data Protector fail to install properly in RHEL 6.

Issue

• Trying to install HP Data Protector 6.11 (sub B6960_15008_01), but while finishing the installation there is some connection refused message as follows :

  Data Protector software package successfully installed
    Importing client to morfeo.regione.toscana.it...
  [12:1625] Import host failed.
          System error: [239] Connection refused
  

OB2-CORE rpm installation script fails with this message:

"ERROR: Data Protector socket number 5555 is already occupied". 

Now, it seems the service is not starting and listening on the port 5555.

# telnet localhost 5555
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused

What is wrong? How to fix this?