ControlChannelTriggerStatus ControlChannelTriggerStatus ControlChannelTriggerStatus ControlChannelTriggerStatus Enum


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.


This enumeration is not supported on Windows Phone.

public : enum class ControlChannelTriggerStatuspublic enum ControlChannelTriggerStatusPublic Enum ControlChannelTriggerStatus// This API is not available in Javascript.
Windows 10 requirements
Device family
Windows Desktop Extension SDK (introduced v10.0.10240.0) Windows Mobile Extension SDK (introduced v10.0.10240.0)
API contract
Windows.Networking.Sockets.ControlChannelTriggerContract (introduced v1)


HardwareSlotAllocated HardwareSlotAllocated HardwareSlotAllocated HardwareSlotAllocated

A hardware slot was allocated by the system.

HardwareSlotRequested HardwareSlotRequested HardwareSlotRequested HardwareSlotRequested

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

PolicyError PolicyError PolicyError PolicyError

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.

ServiceUnavailable ServiceUnavailable ServiceUnavailable ServiceUnavailable

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.

SoftwareSlotAllocated SoftwareSlotAllocated SoftwareSlotAllocated SoftwareSlotAllocated

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

SystemError SystemError SystemError SystemError

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

TransportDisconnected TransportDisconnected TransportDisconnected TransportDisconnected

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 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: