ERROR_OPLOCK_HANDLE_CLOSED - 803 (0x323)
The handle with which this oplock was associated has been closed. The oplock is now broken.
Updated: Feb 21, 2026
Technical Meaning
This error code indicates that the handle associated with an open file or directory object, which was previously used for opportunistic locking (oplock), has been closed. An oplock is a mechanism that allows a client to temporarily bypass server-to-client data transfers, improving performance by reducing network traffic.
Error Details
When this error occurs, it signifies that the handle associated with an oplock has been closed prematurely or as part of normal operation. This can happen due to various reasons such as explicit handle closure by the application or system processes managing resources.
Usage Context
This error is typically encountered in file and directory operations where oplocks are used, such as when a client application opens a file for read/write access. The oplock mechanism allows the client to delay sending requests to the server until necessary, thereby reducing network traffic and improving performance.
Developer Interpretation
Developers should interpret this error as an indication that the handle associated with the oplock has been closed, leading to the breaking of the oplock. This can affect ongoing operations that rely on the oplock for improved performance. Developers should ensure that all handles are properly managed and closed when no longer needed to avoid such errors.
Related Errors
- ERROR_OPLOCK_REQUEST_DENIED (0x124)
- ERROR_OPLOCK_BREAK_IN_PROGRESS (0x325)
- ERROR_HANDLE_EOF (0x80)
FAQ
Q: What does the error mean?
A: The handle associated with an oplock has been closed, breaking the oplock.
Q: How can I prevent this error?
A: Ensure that all handles are properly managed and closed when no longer needed to avoid premature closure of oplocks.
Summary
The ERROR_OPLOCK_HANDLE_CLOSED (803) error indicates that an oplock handle has been closed, breaking the associated oplock. This can affect file and directory operations where performance is improved through the use of oplocks. Developers should manage handles carefully to avoid such errors.