Once you start The Dude, have created a map of the machines on the network, how come on some of the same despite the SNMP service is enabled are not able to get the full statistics, type, cpu, mem, disk, and there appears mainly on the relationship TX RX network traffic, the latter visible in the map on the line is drawn from the root to the machine in question. Maybe it is the network card?

check if there is no firewall on these devices, or in between.

check if there is no firewall on these devices, or in between.

I disabled the windows firewall on a machine where I had the problem and now I see everything ..

I do the same on other computers?

But this is not vulmerabile to attack?

why not add a firewall exception for that port/ip address?