ERROR_EVT_SUBSCRIPTION_TO_DIRECT_CHANNEL - 15009 (0x3AA1)
The caller is trying to subscribe to a direct channel which is not allowed. The events for a direct channel go directly to a logfile and cannot be subscribed to.
Updated: Feb 21, 2026
Technical Meaning
This error code, ERROR_EVT_SUBSCRIPTION_TO_DIRECT_CHANNEL with the numeric value of 15009 or hexadecimal value 0x3AA1, indicates that an attempt has been made to subscribe to a direct channel which is not permitted. Direct channels in Windows Event Tracing (ETW) are designed such that their events are directly written to a log file and cannot be subscribed to for further processing.
Error Details
Direct channels in ETW serve the purpose of logging critical system information without the overhead associated with subscription-based tracing. Attempting to subscribe to these channels results in this error because subscribing would imply an attempt to process or manipulate events that are intended solely for direct logging purposes.
Usage Context
This error is typically encountered when a developer attempts to use ETW APIs to subscribe to a channel that has been designated as a direct channel. Direct channels are often used by the operating system itself and are not meant to be interacted with in this manner.
Developer Interpretation
Developers should understand that subscribing to a direct channel is not supported, as these channels are intended for logging purposes only. If an application needs access to events from such channels, it must rely on indirect methods provided by the operating system or other means of event collection and processing.
Related Errors
ERROR_EVT_CHANNEL_NOT_FOUND(15002) - Indicates that a specified channel does not exist.ERROR_EVT_INVALID_CHANNEL_NAME(15003) - Indicates an invalid name was provided for the channel.ERROR_EVT_SUBSCRIPTION_IN_PROGRESS(15004) - Indicates that another subscription is in progress and cannot be completed.
FAQ
Q: Can I subscribe to a direct channel?
A: No, subscribing to a direct channel is not allowed. Direct channels are intended for logging purposes only.
Q: What should I do if I encounter this error?
A: Ensure that you are using the correct type of channel and that your application is designed to handle indirect methods of event collection and processing.
Summary
ERROR_EVT_SUBSCRIPTION_TO_DIRECT_CHANNEL (15009) indicates an attempt to subscribe to a direct channel, which is not allowed. Developers should understand this error's context within the Windows Event Tracing framework and ensure their applications are designed appropriately for indirect event collection methods.