Scan network for switches and routers

Scan network for switches and routers

Hello.
I'm trying to add my switches to assets list, but when I add network, for example, 172.17.0.0 - 172.17.0.255 and specify snmp community (RO or RW) I'm getting an error " General failure while scanning node." for every switch, router or access point while scannig the network.
Any ideas?
thanks

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