[Observium] Unix-agent not working at remote nodes

Hi all,

I've got an Observium vserver with Professional license, all working okay, but the Unix agent seems to work only for the localhost. The remote machines are correctly inventoried and checked, a telnet on remote 36602/tcp port returns the values reading as it should do, but no relevant data in the node profiles. The unix agent module has been enabled as in Device mode, but even the config.php line has been tried without luck.

Any ideas? Thanks Luca