E2724 SNMP Trouble

Hi, i've two netapp e2724 (managed by Santricity 11.10.0G00.0020, firmware, but i can't see them with the SNMP protocol, even if i configured my host as the destination of the Traps.

As usual, because i would like monitor them with Nagios, i tried with a smnpwalk command that it can't find anything, so i tried with a nmap scan but the result is 0 port open...ouch!

is there something on the netapp that i can check? the network is fine and there isn't firewall or something...