Knowledge

WSAEINVALIDPROCTABLE - 10104 (0x2778)

The procedure call table is invalid.

Updated: Feb 21, 2026

Technical Background

The WSAEINVALIDPROCTABLE error code is a specific error encountered in the Windows Sockets (Winsock) API, which is used for network programming. This error indicates that an invalid procedure call table was detected during the execution of certain Winsock functions.

Error Details

Error Name: WSAEINVALIDPROCTABLE Numeric Code: 10104 Hex Code: 0x2778 Short Description: The procedure call table is invalid.

This error typically occurs when the system encounters a situation where the expected function pointers in the procedure call table are not valid or do not point to the correct functions. This can happen due to various reasons, such as incorrect initialization of Winsock components or corruption in the system's memory.

Common Causes

  • Invalid Initialization: The Winsock library was not properly initialized before making a network-related function call.
  • Memory Corruption: There might be issues with the memory where the procedure call table is stored, leading to invalid pointers.
  • Incorrect Usage Context: Using functions in an inappropriate context or environment can lead to this error.

Real-World Context

This error is more likely to occur in environments where network programming is heavily utilized. Developers working on applications that involve socket operations should be aware of the potential for this error and take appropriate measures to ensure proper initialization and validation of function pointers.

Is This Error Critical?

The criticality of this error depends on the context in which it occurs. In most cases, it indicates a programming or configuration issue rather than a critical system failure. However, if not addressed, it can lead to application crashes or unexpected behavior.

How to Diagnose

  1. Review Operation Context: Ensure that all network-related operations are performed within the correct context and environment.
  2. Validate Parameters: Check for any invalid parameters passed to Winsock functions.
  3. Confirm Object Types: Verify that the object types used in function calls match the expected types.
  4. Verify Input Data: Validate that input data is correctly formatted and does not contain corrupt or invalid values.
  5. Check Limits or Constraints: Ensure that no limits are exceeded, such as maximum number of open sockets.

How to Resolve

  1. Correct Parameter Usage: Ensure all parameters passed to Winsock functions are valid and properly initialized.
  2. Adjust Operation Context: Make sure the application is running in an environment where network operations can be performed correctly.
  3. Restore Data: If memory corruption is suspected, attempt to restore or reinitialize affected data structures.
  4. Retry Operation with Valid Inputs: Attempt to perform the operation again with valid inputs and ensure all prerequisites are met.

Developer Notes

Developers should pay close attention to initialization routines for Winsock components and ensure that all function pointers in the procedure call table are correctly set up before making any network-related calls. Additionally, thorough validation of input parameters can help prevent this error from occurring.

Related Errors

  • WSAEINVAL: Invalid argument passed to a Winsock function.
  • WSAENETDOWN: The network subsystem has failed or is not available.
  • WSAEADDRINUSE: Address already in use, cannot bind socket.

FAQ

Q: What does WSAEINVALIDPROCTABLE mean?

A: It indicates that an invalid procedure call table was detected during the execution of a Winsock function.

Q: How can I prevent this error from occurring?

A: Ensure proper initialization of Winsock components and validate all parameters passed to network-related functions.

Q: Is WSAEINVALIDPROCTABLE critical for system stability?

A: Generally, it is not a critical issue but may indicate underlying problems that need addressing.

Summary

The WSAEINVALIDPROCTABLE error code 10104 in the Windows Sockets API indicates an invalid procedure call table. This can be caused by improper initialization or memory corruption and should be addressed to ensure proper network operations. Developers are advised to validate parameters, confirm object types, and check for any potential issues with input data.