OMNN quick discovery problem

Hello,

I recently installed the Openmanage Network Manager

Problem is that when running a quick discovery against 3 switch stacks that we have here on the network we get the following " 3 address(es) did not respond to Ping"

Switch Stack #1 contains 4 Powerconnect 6248P switch.

Switch stack #2 contains 2 Powerconnect 6248P switchs.

Switch stack #3 contains 2 Powerconnect 6248P switchs.

ICMP is not enabled on these switch stacks so therefore no pinging allowed to them.

Do I need to turn on ICMP on the switch stacks in order to get OMNN to collect data?

Can OMNN collect info on these switches in another method like SNMP or HTTP?

Thanks