There are three ways to set up the connecting link lines:
Note: The Interface service must be included in the scan.
Note: When you use one of the automatic discover options, particularly when discovering interfaces on a router or switch, you need to enter the SNMP community string in the appropriate scan dialog. This lets the scan identify all the interfaces on the device.
If scanning a specific device (from the Device Properties > Active Monitors dialog), with the device selected, right-click and select Properties, then select Credentials. From SNMP v1/v2/v3 credentials, select Public. Click Active Monitors, then click Discover.
When you create links manually, the links are always connected links.
Both connect and disconnect skips the dialog if there is only one active monitor on the device, because it assumes you meant the existing monitor.