<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: HTTP Full Web Page Sensor

Sensor Name

Enter a meaningful 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.

Parent Tags

Shows tags that the sensor inherits from its parent device, parent group, and parent probe. This setting is shown for your information only and cannot be changed here.

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 (<>).

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

• httpfullsensor

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. If the reply takes longer than this value, the sensor cancels the request and shows a corresponding error message. Enter an integer value. The maximum value is 900 seconds (15 minutes).

URL

Enter the address of the web page that the sensor loads. It has to be URL encoded. If you enter an absolute URL, this address is independent of the IP Address/DNS Name setting of the parent device.

PRTG uses a smart URL replacement that lets you use the parent device's IP Address/DNS Name setting as part of the URL. For more information, see section Smart URL Replacement.

Browser Engine

Define which browser engine the sensor uses to load the web page:

• Chromium (recommended): Use the WebKit engine that is delivered with PRTG to measure the loading time. With each scanning interval, PRTG loads the URL in an instance of Chromium and measures the time it takes to fully load the page. This is the recommended setting.
  Chromium does not support TLS 1.2-only connections. In this case, we recommend that you use the PhantomJS engine or Internet Explorer instead.
• PhantomJS (Headless Webkit): Use the PhantomJS engine. This engine can have a high impact on the probe system's CPU and memory load but additional options for result handling are available (see below).
• Internet Explorer: With each scanning interval, the URL is loaded in the background in an instance of Internet Explorer. PRTG uses the Internet Explorer of the probe system.
  For full functionality, we strongly recommend that you install Internet Explorer 11 or higher on the probe system.

All browser engines use the proxy settings from the Windows user account that the probe runs on (this is usually the Windows local "system" user account, if not manually changed). To use a proxy, adjust the settings accordingly on the probe system (on all cluster nodes, if in a cluster). For more information, see the Knowledge Base: How can I access proxy settings for the HTTP Full Web Page Sensor?

Security Context

Define the Windows user account that the sensor uses to run the browser engine:

• Use security context of probe service (default): Run the browser engine under the same Windows user account that the probe runs under. By default, this is the local Windows "system" user account (if not manually changed).
• Use Windows credentials of parent device: Use the Windows user account defined in the settings of the parent device. Open the parent device settings to change the Windows credentials.
  We recommended that you use this setting when using the Chromium browser engine.

Result Handling

This setting is only visible if you select the PhantomJS engine above. Specify how the browser engine handles the result:

• Discard HTML result (recommended): Do not store the requested web page.
• Render and store a screenshot of most recent sensor result as JPG: Render and store the last result of the web page to the \Logs\sensors subfolder of the PRTG data directory on the probe system (master node, if in a cluster). This is for debugging purposes. The file is overwritten with each scanning interval. It is named using the pattern Fullpage of Sensor (ID).jpg.
• Render and store screenshots of all sensor results as JPGs (requires lots of disk space): Render and store one new screenshot of the web page with each sensor scan, and store the screenshots in the \Screenshots (Fullpage Sensor) subfolder of the PRTG data directory on the probe system. You can use this option to create a visual history of the web page.
  Depending on the monitored website and the scanning interval of the sensor, this option can create a very high amount of data. Use this option with care and make sure you set appropriate data purging limits in the Core & Probes settings.

If necessary, you can change the window size of the rendered screenshots. For details, see the Knowledge Base: How can I change the size of PhantomJS full web page screenshots?

Depending on the result handling method you choose, the sensor not only stores files in the screenshot directory but also in an extra cache directory. If the disk on the probe system runs full, check this path (you might have to appropriately set folder options to see this directory):

C:\Windows\System32\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5

Authentication

This setting is only visible if you enable PhantomJS (Headless Webkit) above. Define if the monitored web page needs authentication for access:

• No authentication needed: Access to the web page is granted without authentication.
• Web page needs authentication: PRTG automatically tries to use HTTP basic authentication (BA) or Windows NT LAN Manager (NTLM) to access the web page with authentication. Enter the credentials below.
  Basic access authentication forwards the credentials in plain text.

User

This setting is only visible if you enable PhantomJS (Headless Webkit) above. Enter the username for the web page.

Password

This setting is only visible if you enable PhantomJS (Headless Webkit) above. Enter the password for the web page.

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.

Scanning Interval

Select a scanning interval from the dropdown list. The scanning interval determines the amount of time that the sensor waits between two scans. Choose from:

• 30 seconds
• 60 seconds
• 5 minutes
• 10 minutes
• 15 minutes
• 30 minutes
• 1 hour
• 4 hours
• 6 hours
• 12 hours
• 1 day

You can change the available intervals in the system administration on PRTG on premises installations.

If a Sensor Query Fails

Select the number of scanning intervals that the sensor has time to reach and to check a device again if a sensor query fails. Depending on the option that you select, the sensor can try to reach and to check a device again several times before the sensor shows the Down status. This can avoid false alarms if the monitored device only has temporary issues. For previous scanning intervals with failed requests, the sensor shows the Warning status. Choose from:

• Set sensor to down immediately: Set the sensor to the Down status immediately after the first request fails.
• Set sensor to warning for 1 interval, then set to down (recommended): Set the sensor to the Warning status after the first request fails. If the second request also fails, the sensor shows the Down status.
• Set sensor to warning for 2 intervals, then set to down: Set the sensor to the Down status only after the third request fails.
• Set sensor to warning for 3 intervals, then set to down: Set the sensor to the Down status only after the fourth request fails.
• Set sensor to warning for 4 intervals, then set to down: Set the sensor to the Down status only after the fifth request fails.
• Set sensor to warning for 5 intervals, then set to down: Set the sensor to the Down status only after the sixth request fails.

Sensors that monitor via Windows Management Instrumentation (WMI) always wait at least one scanning interval before they show the Down status. It is not possible to immediately set a WMI sensor to the Down status, so the first option does not apply to these sensors. All other options can apply.

If you define error limits for a sensor's channels, the sensor immediately shows the Down status. None of the interval options apply.

If a channel uses lookup values, the sensor immediately shows the Down status. None of the interval options apply.

Schedule

Select a schedule from the list. You can use schedules to monitor during a certain time span (days or hours) every week. Choose from:

• None
• Saturdays
• Sundays
• Weekdays
• Weekdays Eight-To-Eight (08:00 - 20:00)
• Weekdays Nights (17:00 - 09:00)
• Weekdays Nights (20:00 - 08:00)
• Weekdays Nine-To-Five (09:00 - 17:00)
• Weekends

You can create schedules, edit schedules, or pause monitoring for a specific time span. For more information, see section Schedules.

Maintenance Window

Select if you want to set up a one-time maintenance window. During a maintenance window, monitoring stops for the selected object and all child objects. They show the Paused status instead. Choose between:

• Not set (monitor continuously): Do not set up a one-time maintenance window. Monitoring is always active.
• Set up a one-time maintenance window: Set up a one-time maintenance window and pause monitoring. You can define a time span for a the pause below.

To terminate an active maintenance window before the defined end date, change the time entry in Maintenance Ends to a date in the past.

Maintenance Begins

This setting is only visible if you enable Set up a one-time maintenance window above. Use the date time picker to enter the start date and time of the one-time maintenance window.

Maintenance Ends

This setting is only visible if you enable Set up a one-time maintenance window above. Use the date time picker to enter the end date and time of the one-time maintenance window.

Dependency Type

Select a dependency type. You can use dependencies to pause monitoring for an object depending on the status of a different object. You can choose from:

• Use parent: Use the dependency type of the parent object.
• Select a sensor: Use the dependency type of the parent object. Additionally, pause the current object if a specific sensor is in the Down status or in the Paused status because of another dependency.

• Master sensor for parent: Make this sensor the master object for its parent device. The sensor influences the behavior of its parent device: If the sensor is in the Down status, the device is paused. For example, it is a good idea to make a Ping sensor the master object for its parent device to pause monitoring for all other sensors on the device in case the device cannot even be pinged. Additionally, the sensor is paused if the parent group is paused by another dependency.

To test your dependencies, select Simulate Error Status from the context menu of an object that other objects depend on. A few seconds later, all dependent objects are paused. You can check all dependencies under Devices | Dependencies in the main menu bar.

Dependency

This setting is only visible if you enable Select a sensor above. Click and use the object selector to select a sensor on which the current object will depend.

Dependency Delay (Sec.)

This setting is only visible if you enable Select a sensor above. Define a time span in seconds for the dependency delay.

After the master sensor for this dependency returns to the Up status, PRTG additionally delays the monitoring of the dependent objects by the time span you define. This can prevent false alarms, for example, after a server restart or to give systems more time for all services to start. Enter an integer value.

This setting is not available if you set this sensor to Use parent or to be the Master sensor for parent. In this case, define delays in the parent device settings or in its parent group settings.

User Group Access

Define the user groups that have access to the sensor. You see a table with user groups and group access rights. The table contains all user groups in your setup. For each user group, you can choose from the following group access rights:

• Inherited: Inherit the access rights settings of the parent object.
• No access: Users in this user group cannot see or edit the sensor. The sensor neither shows up in lists nor in the device tree.
• Read access: Users in this group can see the sensor and view its monitoring results. They cannot edit any settings.
• Write access: Users in this group can see the sensor, view its monitoring results, and edit its settings. They cannot edit its access rights settings.
• Full access: Users in this group can see the sensor, view its monitoring results, edit its settings, and edit its access rights settings.

For more details on access rights, see section Access Rights Management.