HP LD5535 55-inch LED Digital Signage Display set up

Hi, we have a "HP LD5535 55-inch LED Digital Signage Display" at our company which has hundreds of PCs. We want to install the Display monitor on the network.

We already downloaded and installed the display driver and the Utility Tools - "HP Video Over Ethernet" and "HP Network Sign Manager 4" from HP website at [ http://h20565.www2.hp.com/hpsc/swd/public/readIndex?sp4ts.oid=6917288&swLangOid=8&swEnvOid=4062 ]  . 

The utility "HP Video Over Ethernet" could not search it on the network. The PC(IP 10.32.32.30 - Windows 7 professional) and the display are on the same subnet (IP 10.32.32.8) . The PC can ping the monitor.  

The utility "HP Network Sign Manager 4" also could now search it, I can manually add it to the utility, and it shows the monitor's model name and the serial number,  but it could not associate. Could you please help me to fix it?

Thanks.

Andy