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?
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:
apache
httpsensor
httpapachemodstatusperfstatssensor
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 ().
HTTP Specific
HTTP Specific
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.
URL
Enter the URL to the mod_status module on your Apache server. PRTG automatically appends /server-status?auto to it. If you enter an absolute URL, the sensor uses this address independently of the IP Address/DNS Name setting of the parent device.
PRTG uses a smart URL replacement with which you can use the parent device's IP address or Domain Name System (DNS) name setting as part of the URL. For more information, see section Smart URL Replacement.
Authentication
Authentication
Setting
Description
Authentication
Define if authentication is necessary on the web page:
Web page does not need authentication (default)
Web page needs authentication
User Name
This setting is only visible if you select Web page needs authentication above.
If the proxy requires authentication, enter the user name for the proxy login. Enter a string.
Password
This setting is only visible if you select Web page needs authentication above.
Enter a password.
Authentication Method
This setting is only visible if you select Web page needs authentication above.
Select the authentication method that the URL uses:
HTTP authentication (default): Use simple HTTP authentication. This authentication method transmits credentials as plain text.
NT LAN Manager authentication: Use the Microsoft NT LAN Manager (NTLM) protocol for authentication.
Digest access authentication: Use digest access authentication. This applies a hash function to the password, which is safer than HTTP authentication (default).
Sensor Display
Sensor Display
Setting
Description
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 select Stack channels on top of each other above.
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.
Inherited Settings
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.
The proxy settings determine how a sensor connects to a URL. You can enter data for an HTTP proxy server that sensors use when they connect via HTTP or HTTPS.
This setting only applies to sensors and how they monitor. For more information on how to change the proxy settings for the PRTG core server, see section Core & Probes.
Proxy Settings
For more information, see section Root Group Settings, section Proxy Settings.
Scanning Interval
Scanning Interval
For more information, see section Root Group Settings, section Scanning Interval.
Schedules, Dependencies, and Maintenance Window
You cannot interrupt the inheritance for schedules, dependencies, and maintenance windows. The corresponding settings from the parent objects are always active. However, you can define additional schedules, dependencies, and maintenance windows. They are active at the same time as the parent objects' settings.
Schedules, Dependencies, and Maintenance Window
For more information, see section Root Group Settings, section Schedules, Dependencies, and Maintenance Window (default).
Access Rights
Access Rights
For more information, see section Root Group Settings, section Access Rights.
Smart URL Replacement
Instead of entering a complete address in the URL field of an HTTP sensor, you can only enter the protocol followed by a colon and three forward slashes (this means that you can enter either http:/// or https:///, or even a simple forward slash / as the equivalent for http:///). PRTG automatically fills in the parent device's IP Address/DNS Name in front of the third forward slash.
Whether this results in a valid URL or not depends on the IP address or Domain Name System (DNS) name of the parent device. In combination with cloning devices, you can use smart URL replacement to create many similar devices.
For example, if you create a device with the DNS name www.example.com and you add an HTTP sensor to it, you can provide values in the following ways:
If you enter https:/// in the URL field, PRTG automatically creates the URL https://www.example.com/
If you enter /help in the URL field, PRTG automatically creates and monitor the URL http://www.example.com/help
It is also possible to provide a port number in the URL field. It is taken over by the device's DNS name and is internally added, for example, http://:8080/
Smart URL replacement does not work for sensors that run on the probe device.
Channel List
Which channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.
Channel
Description
BusyWorkers
The number of busy worker threads
BytesPerReq
The number of bytes per request
CPULoad
The CPU load
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
IdleWorkers
The number of idle worker threads
ReqPerSec
The number of requests
Uptime
The uptime
More
KNOWLEDGE BASE
Which HTTP status code leads to which HTTP sensor status?