If the Network Scanner displays only one computer, it could mean that:
- its settings are incorrect;
- a firewall is blocking connections;
- IP address settings are incorrect.
If you see multiple devices, but they do not have SNMP information displayed, or their Windows Services status, it could mean that:
- the target devices do not support SNMP;
- the connection settings (i.e. SNMP version and/or access credentials) are incorrect.
The Windows Services status would normally require you to run this application under a domain admin account. If these devices are not Windows computers, there will be nothing shown. On top of that, if there is a firewall on your computer, target device, or in-between, it may also prevent this from working.
May I ask, what are you trying to achieve?