WSAEDISCON - 10101 (0x2775)

Technical Background

The WSAEDISCON error code is a specific return value from the Windows Sockets API functions WSARecv and WSARecvFrom. This error indicates that the remote party has initiated a graceful shutdown sequence, meaning it is closing the connection in an orderly manner. This behavior is part of the standard TCP protocol for handling connections.

Error Details

• Error Name: WSAEDISCON
• Numeric Code: 10101 (0x2775)
• Short Description: Returned by WSARecv or WSARecvFrom to indicate the remote party has initiated a graceful shutdown sequence.

Common Causes

The occurrence of this error is typically due to the following reasons:

• The remote party has decided to close the connection and is sending a final segment before closing it.
• The application on the remote side is shutting down or restarting, which results in the termination of the network session.

Real-World Context

In practical scenarios, this error can be encountered when an application is handling network communication. For example, during file transfers over TCP, if the sender decides to terminate the connection gracefully, it will send a final segment and then close the socket. The receiver would receive WSAEDISCON as part of its normal processing.

Is This Error Critical?

The WSAEDISCON error is not critical in most cases. It indicates that the remote party has initiated a graceful shutdown, which is expected behavior and does not necessarily indicate an error or failure in the application's operation. However, it can be useful for logging purposes to track when connections are being closed normally.

How to Diagnose

To diagnose this issue, consider the following steps:

1. Review Operation Context: Ensure that the network operation context is correct and expected. For instance, if a file transfer is in progress, verify that it has been initiated by both parties.
2. Validate Parameters: Check the parameters passed to WSARecv or WSARecvFrom. Ensure they are valid and correctly configured for the intended operation.
3. Confirm Object Types: Verify that the socket object being used is of the correct type (e.g., TCP) and is properly initialized.
4. Verify Input Data: Confirm that any input data, such as buffer sizes or addresses, are appropriate for the network operation.
5. Check Limits or Constraints: Ensure that there are no system limits or constraints that could affect the network operation.

How to Resolve

If WSAEDISCON is encountered and it does not indicate a failure in your application's logic, no specific action may be required. However, if you need to handle this gracefully within your application, consider the following steps:

• Correct Parameter Usage: Ensure that all parameters are correctly set before initiating network operations.
• Adjust Operation Context: If necessary, adjust the context of the operation to ensure it aligns with expected behavior.
• Restore Data: If any data has been corrupted or lost during transmission, take steps to restore it if possible.
• Retry Operation with Valid Inputs: If the error is due to temporary issues, retrying the operation with valid inputs may resolve the issue.

Developer Notes

Developers should be aware that WSAEDISCON is a normal part of network communication and does not indicate an error in most cases. However, it can be useful for logging purposes to track when connections are being closed normally. Ensure that your application handles this gracefully by implementing appropriate logic to manage the end of network sessions.

Related Errors

• WSAECONNRESET: This error indicates a connection reset by peer, which is different from WSAEDISCON and typically signifies an abrupt termination rather than a graceful shutdown.
• WSAEWOULDBLOCK: This error occurs when the operation would block but can be retried later, which may not directly relate to WSAEDISCON.

FAQ

Q: What does WSAEDISCON mean?

A: The WSAEDISCON error indicates that the remote party has initiated a graceful shutdown sequence and is closing the connection in an orderly manner. This is part of standard TCP protocol behavior for handling connections.

Q: How should I handle WSAEDISCON in my application?

A: In most cases, you do not need to take specific action when encountering WSAEDISCON. However, if your application needs to manage the end of network sessions gracefully, ensure that appropriate logic is implemented.

Q: Is WSAEDISCON critical?

A: The WSAEDISCON error is not typically critical. It indicates a normal shutdown sequence and does not necessarily indicate an error in your application's operation.

Summary

The WSAEDISCON error code is returned by the Windows Sockets API functions WSARecv and WSARecvFrom to indicate that the remote party has initiated a graceful shutdown sequence. This behavior is part of standard TCP protocol handling for connections. While not critical, it can be useful for logging purposes. Developers should ensure their applications handle this gracefully and are aware of related errors such as WSAECONNRESET.