opmanager not acepting IP for discovery

opmanager not acepting IP for discovery

just installed opmanager and it's asking for the networks to discover....
I put in our primary network, 192.168.1.1 with subnet 255.255.255.0 and it don't accept it... secondary network 192.168.2.1 subnet 255.255.255.0 - does not accept.... tertiary network 192.168.3.1 (managed switches, stops people trying to mess if they can't see them ;) ) subnet 255.255.255.0 doesn't accept their ether....

Any ideas?


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