Active Discovery Port Method

Last updated - 25 August, 2025

The Active Discovery Port method attempts a TCP connection on a list of ports, and returns the ports that respond as instances, using the port value as both the Wildcard Alias and Wildcard Value.

Active Discovery Port Parameters

Parameter	Description
Port # List	(Required) A list of ports, such as the following: A single port, for example 80A comma-separated list of ports, for example “81, 81, 90.” A range of ports separated by a dash, for example “800–900”, which represents all ports 800 through 900.Instead of the port number, you can use standard protocol names (such as http or ftp.) For more information, see Service Name and Transport Protocol Port Number Registry from the Internet Assigned Numbers Authority.
Connection timeout	The default connection timeout is 10 seconds. The port is returned as an instance only if the TCP connection succeeds before the timeout. You can specify a timeout value (in seconds) to override the default value.

Example: Memcached Detection with Port Discovery Method

If you run multiple memcached applications on a device, or on different ports on a variety of devices, you can use the “Port” method of Active Discovery to detect and monitor them automatically. The following steps modify a standard DataSource to detect a memcached application on any device that responds on any port from 11211 through 11300:

1. In LogicMonitor, navigate to Settings > Modules. Locate or create the datasource for your memcached application. For more information, see Creating a Datasource.
2. Under Arguments, select “Port” from the Discovery Method dropdown menu.
3. In the Ports List field, enter “11211-11300”.
   
4. Select Save.

If the memcached application is running on ports 11211, 11230, and 11231 of the host, this Active Discovery configuration returns 3 instances that correspond to each of the responding ports.