<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: PerfCounter IIS Application Pool Sensor

The PerfCounter IIS Application Pool sensor monitors a Microsoft Internet Information Services (IIS) application pool via Windows performance counters.

PerfCounter IIS Application Pool Sensor

PerfCounter IIS Application Pool Sensor

i_square_cyanFor a detailed list and descriptions of the channels that this sensor can show, see section Channel List.

Sensor in Other Languages

  • Dutch: PerfCounter IIS Application Pool
  • French: Windows IIS Pool d'applications (PerfCounter)
  • German: Leistungsindikator IIS-Anwendungspool
  • Japanese: パフォーマンスカウンター IIS アプリケーションプール
  • Portuguese: Pool de aplicativos IIS (PerfCounter)
  • Russian: Пул приложений IIS (PerfCounter)
  • Simplified Chinese: 性能计数器 IIS 应用程序池
  • Spanish: Grupo de aplicaciones IIS (PerfCounter)


Consider the following remarks and requirements for this sensor:



Windows version

  • This sensor requires at least Windows Server 2008 R2 on the probe system (on every cluster node, if on a cluster probe).

IIS version 7.5

  • This sensor requires as of Microsoft IIS 7.5 on the target system.

Remote Registry Windows service

  • This sensor requires that the Remote Registry Windows service runs on the target system.
  • If this service does not run, a connection via performance counters is not possible.
  • To enable the service, log in to the respective system and open the services manager (for example, via services.msc). In the list, find the respective service and set its Start Type to Automatic.


  • This sensor requires credentials for Windows systems.
  • We recommend that you use Windows domain credentials.

i_round_redIf you use local credentials, make sure that the same Windows user accounts (with the same user name and password) exist on both the probe system and the target system.

  • Otherwise, a connection via performance counters is not possible. However, WMI connections might still work.

i_round_redThe user account must be a member of the Performance Monitor Users user group on the target system.


  • This sensor supports IPv6.

Performance impact

  • This sensor has a low performance impact.


  • This sensor uses lookups to determine the status values of one or more channels.

Hosted probe

i_podYou 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.

Basic Sensor Settings

Basic Sensor Settings

Basic Sensor Settings

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

  • pciisapppool
  • performancecounter

i_square_cyanFor more information about basic sensor settings, see section Sensor Settings.

IIS Application Pool Specific

IIS Application Pool Specific

IIS Application Pool Specific



Application Pools

The name of the application pool that this sensor monitors.

Sensor Display

Sensor Display

Sensor Display



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.

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

Graph Type

Define how this sensor shows different channels:

  • 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.
    i_round_redYou 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. 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.

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 b_inherited_enabled under the corresponding setting name to disable the inheritance and to display its options.

i_square_cyanFor more information, see section Inheritance of Settings.

Channel List

i_round_blueWhich channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.



Application Pool State

The overall application pool status

  • Up status: Running, Unavailable for Total
  • Warning status: Initialized, Shutdown Pending
  • Down status: Delete Pending, Stopped, Stopping, Unavailable, Uninitialized

i_round_blueThis channel is the primary channel by default.


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

Worker Process Failures

The number of failures in worker processes

Worker Process Ping Failures

The number of failures in worker process pings

Worker Process Shutdown Failures

The number of failures in worker process shutdowns

Worker Process Startup Failures

The number of failures in worker process startups

Worker Processes

The number of worker processes


i_square_blueKNOWLEDGE BASE

What security features does PRTG include?