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ControlChannelTriggerStatus enumeration

Specifies if the system was able to complete configuration of a ControlChannelTrigger object for use by class elements in the Windows.Networking.Sockets and related namespaces.

Note  This enumeration is not supported on Windows Phone.


public enum ControlChannelTriggerStatus




The ControlChannelTriggerStatus enumeration has these members.


The policy check succeeded and a hardware slot has been requested from the system.


The policy check succeeded and a software slot was allocated by the system.


A hardware slot was allocated by the system.


A policy error occurred when the system tried to complete configuration of a ControlChannelTrigger. This error can occur when an app has requested more connections for hardware or software slots than are permitted by system policy.


A system error occurred when the system tried to complete configuration of a ControlChannelTrigger for a hardware slot.


The network transport associated with the ControlChannelTrigger was disconnected. The underlying TCP connection was already disconnected by a TCP reset received from the remote destination or a graceful disconnect by either the app or the remote destination. The most common occurrence is a TCP reset or a graceful disconnect sent by the remote destination.


The service provided by the ControlChannelTrigger is unavailable. This can happen if the network connection broker service is not yet ready but the app is trying to establish a ControlChannelTrigger channel. This status code is provided under the following conditions:

  • When there is fast user switching and the new user is trying to establish the ControlChannelTrigger channel.
  • When the system is entering a low power mode (Connected standby mode) and the app is trying to create a software slot. Software slots are available only when the system is active and not in low power mode.

The mitigation in both these cases is to listen for System Event broker events and register the ControlChannelTrigger channel at that point.


The system maintains a policy on the number of ControlChannelTrigger instances that can be configured for a Windows Store app, to limit resource usage and extend battery life. Once configuration by the system is complete, each ControlChannelTrigger instance represents either a hardware or software slot for an established TCP connection that is to be maintained even when the app is suspended (moved from the foreground to the background).

A local computer system can be in several power states:

  • System active
  • Connected standby
  • Shutdown

An app in the system active mode can receive a control channel trigger when either a software or hardware slot is used. An app in the connected standby mode can only receive a control channel trigger when a hardware slot is used.

Requirements (device family)

Device family


API contract

Windows.Foundation.UniversalApiContract, introduced version 1.0


Windows::Networking::Sockets [C++]



Requirements (operating system)

Minimum supported client

Windows 8

Minimum supported server

Windows Server 2012

Minimum supported phone

None supported


Windows::Networking::Sockets [C++]



See also




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