ERROR_RECEIVE_PARTIAL_EXPEDITED - 709 (0x2C5)
{Partial Expedited Data Received} The network transport returned partial data to its client and this data was marked as expedited by the remote system. The remaining data will be sent later.
Updated: Feb 21, 2026
Introduction
This article provides a detailed explanation of the Windows error code ERROR_RECEIVE_PARTIAL_EXPEDITED with numeric value 709 and hexadecimal representation 0x2C5. It covers technical background, common causes, real-world context, diagnostic guidance, resolution strategies, and related errors.
Technical Background
The ERROR_RECEIVE_PARTIAL_EXPEDITED error is a specific network-related error that occurs when the Windows networking stack receives partial data marked as expedited from a remote system. This condition typically indicates that the network transport layer has returned incomplete data to its client application, but the remaining data will be sent later.
Error Details
- Error Name:
ERROR_RECEIVE_PARTIAL_EXPEDITED - Numeric Code: 709
- Hex Code: 0x2C5
- Short Description: Partial expedited data received from the network transport layer.
Common Causes
The error is commonly caused by:
- Incomplete data transmission due to network conditions or congestion.
- The remote system marking partial data as expedited, indicating that it should be processed before other data.
- Network protocols handling data in a way that results in partial data being received first.
Real-World Context
This error can occur in various scenarios where network communication is involved. For example, when using the Windows Sockets API (Winsock) for network programming, applications may encounter this error if they attempt to read more data than has been sent by the remote system or if the remote system sends partial data marked as expedited.
Is This Error Critical?
The criticality of this error depends on the application's requirements. In most cases, it is not a critical failure and can be handled gracefully by the application. However, in scenarios where complete data integrity is essential, this error may indicate that additional steps are needed to ensure data completeness.
How to Diagnose
To diagnose the issue:
- Review Operation Context: Ensure that the network operation context is correct and that the application is handling partial data appropriately.
- Validate Parameters: Verify that the parameters passed to the networking functions are valid and appropriate for the expected data size.
- Confirm Object Types: Confirm that the objects being used (such as sockets) are of the correct type and in a valid state.
- Verify Input Data: Ensure that the input data is complete and not corrupted.
- Check Limits or Constraints: Verify that the application is not exceeding any system limits related to network operations.
How to Resolve
To resolve the issue, consider the following steps:
- Correct Parameter Usage: Ensure that parameters are used correctly and that the expected data size matches the actual data received.
- Adjust Operation Context: Adjust the operation context if necessary, such as by setting appropriate timeouts or buffer sizes.
- Restore Data: If partial data is received, ensure that it is processed appropriately and that any missing data will be received later.
- Retry Operation with Valid Inputs: Retry the network operation with valid inputs to ensure that all expected data is received.
Developer Notes
Developers should handle this error by ensuring that their applications can gracefully process partial data and are prepared for expedited data transmission scenarios. This may involve implementing retry logic or buffering mechanisms to handle incomplete data transmissions.
Related Errors
ERROR_PARTIAL_DATA(109): Indicates that a read operation returned only part of the requested data.ERROR_IO_INCOMPLETE(996): Occurs when an I/O operation is not yet complete and may be related to network operations.
FAQ
Q: What does the ERROR_RECEIVE_PARTIAL_EXPEDITED error indicate?
A: This error indicates that partial expedited data has been received from a remote system, which means that the remaining data will be sent later. It is not necessarily an error but can be handled appropriately by the application.
Q: How should I handle this error in my application?
A: Applications should validate the received data and ensure that it processes partial data correctly. Implementing retry logic or buffering mechanisms may be necessary to handle such scenarios gracefully.
Summary
The ERROR_RECEIVE_PARTIAL_EXPEDITED error is a specific network-related condition where partial expedited data is received from a remote system. While not critical, developers should ensure their applications can handle this scenario appropriately by validating parameters and processing partial data correctly.