Although i can render normally with the default Vray engine i cant use the privileges (speed-scene real time update) of the RT-Cuda engine because RT renderer stuck into the "Preparing global Light Manager"...

From the screenshot below i noticed that
"Starting DR 1
dr host: 127.0.0.1:20211
Could not connect to host 127.0.0.1:20211: An attempt was made to access a socket in a way forbidden by its access permissions.
Could not use any of the selected (1) hosts for distributed rendering!"

Specs

AMD Phenom II X4 965
Nvidia 440GT
Corsair 8gb DDRII
Windows 7 SP1 X64
ZoneAlarm Antiv+Firewall 13.3.209 (Tried with the firewall disabled too)

Anybody knows why?