WSA_QOS_EPOLICYOBJ - 11025 (0x2B11)
An invalid policy object was found in the QOS provider-specific buffer.
Updated: Feb 21, 2026
Technical Background
The error code WSA_QOS_EPOLICYOBJ (11025, 0x2B11) is encountered when a Windows Socket Quality of Service (QoS) provider-specific buffer contains an invalid policy object. This error typically arises in the context of network programming and socket operations where QoS policies are being applied.
Error Details
The WSA_QOS_EPOLICYOBJ error code signifies that the system has detected a problem with the QoS policy object within the provider-specific buffer. The QoS framework is responsible for managing Quality of Service settings, which can include bandwidth allocation, latency requirements, and other network performance parameters.
Common Causes
- Invalid Policy Object: The policy object provided by the application or user does not conform to the expected format or structure required by the QoS provider.
- Unsupported Operation: Attempting to apply a QoS policy that is not supported by the current system configuration or network environment.
- Incorrect Usage Context: Misuse of the API functions related to QoS, such as incorrect parameter values or out-of-context operations.
Real-World Context
This error can occur in scenarios where applications attempt to configure QoS settings for network traffic. For example, when setting up a socket with specific QoS requirements using WSAQOS structures, the system may return this error if the provided policy object is invalid or unsupported.
Is This Error Critical?
The criticality of this error depends on the application's functionality and the importance of the network traffic being managed. In most cases, it indicates a misconfiguration that needs to be corrected before proceeding with QoS operations.
How to Diagnose
- Review Operation Context: Ensure that the operation context is appropriate for applying QoS policies.
- Validate Parameters: Check the parameters passed to the API functions related to QoS, such as
WSAQOS, to ensure they are valid and correctly formatted. - Confirm Object Types: Verify that the policy object being used conforms to the expected format and structure required by the QoS provider.
How to Resolve
- Correct Parameter Usage: Ensure all parameters passed to the API functions related to QoS are correct and properly formatted.
- Adjust Operation Context: If the operation context is incorrect, adjust it to ensure compatibility with the QoS framework.
- Restore Data: If data corruption or invalid state is suspected, restore the policy object to a valid state.
Developer Notes
Developers should carefully validate all parameters and objects passed to QoS-related API functions to avoid encountering this error. Additionally, understanding the specific requirements of the QoS provider can help in ensuring that the correct policies are applied.
Related Errors
WSAEINVAL: Invalid argument provided to a function.WSAENOSYS: The requested operation is not supported by the system or network environment.
FAQ
What does WSA_QOS_EPOLICYOBJ mean?
WSA_QOS_EPOLICYOBJ indicates that an invalid policy object was found in the QoS provider-specific buffer, preventing the application from configuring Quality of Service settings correctly.
How can I prevent this error?
Ensure all parameters and objects passed to QoS-related API functions are valid and conform to the expected format. Validate the operation context to ensure it is appropriate for applying QoS policies.
Can this error occur in any application?
Yes, any application that uses QoS settings for network traffic can encounter this error if the policy object provided is invalid or unsupported by the system.
Summary
The WSA_QOS_EPOLICYOBJ error code (11025, 0x2B11) indicates an issue with a QoS policy object in the provider-specific buffer. This error can be caused by invalid parameters, unsupported operations, or incorrect usage context. Developers should validate all inputs and ensure they are compatible with the QoS framework to avoid this error.