PRTG Manual: Port Range Sensor

Sensor Name

Enter a name to identify the sensor. By default, PRTG shows this name in the device tree, as well as in alarms, logs, notifications, reports, maps, libraries, and tickets.

If the name contains angle brackets (<>), PRTG replaces them with braces ({}) for security reasons. For more information, see the Knowledge Base: What security features does PRTG include?

Parent Tags

Shows tags that the sensor inherits from its parent device, parent group, and parent probe.

This setting is for your information only. You cannot change it.

Tags

Enter one or more tags. Confirm each tag with the Spacebar key, a comma, or the Enter key. You can use tags to group objects and use tag-filtered views later on. Tags are not case-sensitive. Tags are automatically inherited.

It is not possible to enter tags with a leading plus (+) or minus (-) sign, nor tags with parentheses (()) or angle brackets (<>).

For performance reasons, it can take some minutes until you can filter for new tags that you added.

The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:

▪portrangesensor

Priority

Select a priority for the sensor. This setting determines the position of the sensor in lists. The highest priority is at the top of a list. Choose from the lowest priority () to the highest priority ().

Timeout (Sec.)

Enter a timeout in seconds for the request. Enter an integer. The maximum timeout value is 900 seconds (15 minutes).

If the reply takes longer than this value, the sensor cancels the request and shows a corresponding error message.

Port-by-Port Delay (ms)

Define how long the sensor waits in milliseconds (ms) to go to the next port while it runs through all specified ports.

Port Range Selection Method

Define whether you want to monitor all ports within a range or if you want to monitor several individual ports:

▪Port range: Monitor ports within a range.

▪List of ports: Monitor several individual ports.

Range Start

This setting is only visible if you select Port range above. Enter the port number where the scan starts. Enter an integer.

Range End

This setting is only visible if you select Port range above. Enter the port number where the scan ends. Enter an integer.

Port List

This setting is only visible if you select List of ports above. Enter the numbers of the ports that the sensor tries to connect to. Enter one or more individual integers. Enter each port in one line.

If Value Changes

Define what the sensor does if the number of closed ports or open ports changes:

▪Ignore changes: Do nothing.

▪Trigger 'change' notification: Send an internal message indicating that the value has changed. In combination with a change trigger, you can use this mechanism to trigger a notification whenever the sensor value changes.

Primary Channel

Select a channel from the list to define it as the primary channel. In the device tree, the last value of the primary channel is always displayed below the sensor's name. The available options depend on what channels are available for this sensor.

You can set a different primary channel later by clicking below a channel gauge on the sensor's Overview tab.

Graph Type

Define how different channels are shown for this sensor:

▪Show channels independently (default): Show a graph for each channel.

▪Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
You cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).

Stack Unit

This setting is only visible if you enable Stack channels on top of each other as Graph Type. Select a unit from the list. All channels with this unit are stacked on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so.

Available

The time until requests to ports are accepted in milliseconds (msec)

This channel is the primary channel by default.

Closed Ports

The number of closed ports

Downtime

In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status

Open Ports

The number of open ports