For successful discovery of the resources on your network, this software requires authenticated management access to the device. To get this access, you must provide the correct SNMP community strings, WMI login credentials, and any other command-line (Telnet / SSH) or browser (HTTP/HTTPS) authentication, and SNMP must be turned on, if that is not the device’s default. Some devices require pre-configuration to recognize this management software. Consult your network administrator or the device’s manuals for instructions about how to enable those. See Authentication for more.

If you do not get access to the deepest level of authentications--for example the “enable” user’s--you cannot access all of Open Manage Network Manager’s functionality.