ERROR_IO_PRIVILEGE_FAILED - 571 (0x23B)
{Privilege Failed} The I/O permissions for the process could not be changed.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_IO_PRIVILEGE_FAILED error code indicates that a process attempted to change its I/O permissions, but the operation was not successful due to insufficient privileges. This error is typically encountered when an application or service attempts to perform operations that require elevated privileges.
Error Details
- Error Name: ERROR_IO_PRIVILEGE_FAILED
- Numeric Code: 571 (0x23B)
- Short Description: {Privilege Failed} The I/O permissions for the process could not be changed.
This error suggests that the current security context of the process does not have sufficient privileges to perform the requested operation. It is important to note that this error can occur in various contexts, such as when attempting to access certain system files or devices that require administrative rights.
Usage Context
The ERROR_IO_PRIVILEGE_FAILED error code is commonly encountered in scenarios where an application attempts to modify I/O operations that are restricted by the current security policy. This includes operations such as accessing specific device drivers, modifying system settings, or performing file operations on protected directories.
Developer Interpretation
Developers should interpret this error as a signal that the process lacks the necessary privileges to execute the requested operation. To resolve this issue, the application may need to be run with elevated permissions or the security policy may need to be adjusted to allow the required operations.
Related Errors
- ERROR_ACCESS_DENIED (5): This error can occur if the process does not have any form of access rights to the resource being accessed. It is a more general permission failure and does not specifically indicate an issue with I/O privileges.
- ERROR_PRIVILEGE_NOT_HELD (1314): This error code indicates that the process lacks the specific privilege required for the operation, which can be related but distinct from
ERROR_IO_PRIVILEGE_FAILED.
FAQ
Q: What does ERROR_IO_PRIVILEGE_FAILED mean?
A: It means that a process attempted to change its I/O permissions but was denied due to insufficient privileges.
Q: How can this error be resolved?
A: The application should either run with elevated permissions or the security policy should be adjusted to allow the required operations.
Summary
The ERROR_IO_PRIVILEGE_FAILED error code is a specific indication that an attempt to change I/O permissions was unsuccessful due to insufficient privileges. Developers should ensure their applications have the necessary permissions and consider running them with elevated rights if needed.