PRTG Manual: Port Sensor
The Port sensor monitors a network service by connecting to its port. It tries to connect to the specified TCP/IP port number of a device and waits for the request to be accepted.
Depending on your settings, the sensor can alert you either when the monitored port is open or when it is closed.
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
- Dutch: Poort
- French: Port
- German: Port
- Japanese: ポート
- Portuguese: Porta
- Russian: Порт
- Simplified Chinese: 端口
- Spanish: Puerto
Consider the following remarks and requirements for this sensor:
Remark |
Description |
---|---|
SRP ciphers |
This sensor does not support Secure Remote Password (SRP) ciphers. |
IPv6 |
This sensor supports IPv6. |
Performance impact |
This sensor has a very low performance impact. |
Hosted probe |
You cannot add this sensor to the hosted probe of a PRTG Hosted Monitor instance. If you want to use this sensor, add it to a remote probe device. |
The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:
- portsensor
For more information about basic sensor settings, see section Sensor Settings.
Setting |
Description |
---|---|
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 |
Enter the number of the port to which this sensor connects. Enter an integer. |
Setting |
Description |
---|---|
Transport-Level Security |
Define the security of the connection:
|
Setting |
Description |
---|---|
Goal |
Define how the sensor reports on the port:
|
Command Handling |
This setting is only visible if you select Open above. Define whether the sensor sends a command after it opens the port:
|
Command |
This setting is only visible if you select Send a command above. Enter the command that the sensor sends to the respective port in a Telnet session. Enter a string. You cannot use line breaks. You can only use a simple Telnet command in a single line. |
Response |
Define if the sensor further processes the response:
|
Allowed Response Code |
This setting is only visible if you select Check response code (integer) above. Enter the code that the target device must return. If the target device does not return this code, the sensor shows the Down status. Enter an integer. |
Check for Keywords (positive) |
This setting is only visible if you select Check response text above. Check if the response contains a specific keyword:
|
Response Must Include (Down Status if Not Included) |
This setting is only visible if you select Enable keyword check (positive) above. Define the search string that the response must contain. You can enter a simple string in plain text or a regular expression (regex). The search string must be case-sensitive. If the data does not include the search pattern, the sensor shows the Down status. |
Search Method |
Define the method with which you want to provide the search string:
The characters * and ? work as placeholders. * stands for no number or any number of characters and ? stands for exactly one character. You cannot change this behavior. The literal search for these characters is only possible with a regex.
PRTG supports Perl Compatible Regular Expression (PCRE) regex. For more information, see section Regular Expressions. |
Check for Keywords (negative) |
This setting is only visible if you select Simple string search (default) above. Check if the response does not contain a specific keyword:
|
Response Must Not Include (Down Status if Included) |
This setting is only visible if you select Enable keyword check (negative) above. Define the search string that the response must not contain. You can enter a simple string in plain text or a regex. The search string must be case-sensitive. If the data does include the search pattern, the sensor shows the Down status. |
Search Method |
Define the method with which you want to provide the search string:
The characters * and ? work as placeholders. * stands for no number or any number of characters and ? stands for exactly one character. You cannot change this behavior. The literal search for these characters is only possible with a regex.
PRTG supports Perl Compatible Regular Expression (PCRE) regex. For more information, see section Regular Expressions. |
Result Handling |
Define what PRTG does with the sensor result:
In a cluster, PRTG stores the result in the PRTG data directory of the master node. |
Setting |
Description |
---|---|
Primary Channel |
Select a channel from the list to define it as the primary channel. In the device tree, PRTG displays the last value of the primary channel 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 this sensor shows different channels:
|
Stack Unit |
This setting is only visible if you select Stack channels on top of each other above. Select a unit from the list. PRTG stacks all channels with this unit 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. |
By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click under the corresponding setting name to disable the inheritance and to display its options.
For more information, see section Inheritance of Settings.
Which channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.
Channel |
Description |
---|---|
Available |
The time until a request to a port is accepted This channel is the primary channel by default. |
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 |
KNOWLEDGE BASE
What security features does PRTG include?