WSAEADDRNOTAVAIL - 10049 (0x2741)
The requested address is not valid in its context.
Updated: Feb 21, 2026
Technical Background
The WSAEADDRNOTAVAIL error is a specific error code returned by the Windows Sockets (Winsock) API. This error indicates that an invalid address was provided for a network operation, which is not valid in its current context.
Error Details
Error Name: WSAEADDRNOTAVAIL Numeric Code: 10049 Hex Code: 0x2741 Short Description: The requested address is not valid in its context.
This error typically occurs when a network operation, such as binding to an address or connecting to another host, receives an invalid IP address or socket address. It can also arise from incorrect port numbers or other parameters that are not compatible with the current network configuration.
Common Causes
- Invalid Parameter Values: Providing an IP address or port number that does not exist or is out of range for the specified protocol (e.g., IPv4 vs. IPv6).
- Incorrect Object Type: Attempting to bind a socket to an address type that is incompatible with the operation, such as binding a UDP socket to a TCP address.
- Exceeding Limits: Trying to use a port number that has already been allocated or is reserved for system use.
Real-World Context
This error can occur in various scenarios where network operations are performed. For instance, when developing applications that require network communication, developers must ensure that the addresses and ports they specify are valid and compatible with their intended usage context.
Is This Error Critical?
The severity of this error depends on the application's requirements. If an application needs to establish a connection or bind to a specific address, encountering WSAEADDRNOTAVAIL can halt execution until the issue is resolved. However, it does not necessarily indicate a critical failure in the system itself.
How to Diagnose
To diagnose this error, developers should:
- Review Operation Context: Ensure that the network operation being performed is appropriate for the current environment and configuration.
- Validate Parameters: Check that all parameters passed to the network function are valid and within acceptable ranges. This includes IP addresses, port numbers, and other address-related fields.
- Confirm Object Types: Verify that the socket type (e.g., TCP, UDP) is compatible with the address family being used (e.g., IPv4 or IPv6).
How to Resolve
To resolve this error, developers should:
- Correct Parameter Usage: Ensure that all parameters are correctly specified and valid for the operation.
- Adjust Operation Context: If necessary, adjust the network configuration or context in which the operation is being performed. This might involve changing IP addresses, port numbers, or other relevant settings.
- Restore Data: In cases where data corruption could be a factor, restore any corrupted address information to valid values.
Developer Notes
Developers should pay close attention to network configuration and parameter validation when working with the Windows Sockets API. Ensuring that all addresses and ports are correctly specified can prevent this error from occurring and improve application reliability.
Related Errors
- WSAEADDRINUSE: A related error indicating that an address is already in use by another process or socket.
- WSAEAFNOSUPPORT: An error indicating that the address family provided is not supported by the system.
FAQ
Q: What does WSAEADDRNOTAVAIL mean?
A: The WSAEADDRNOTAVAIL error indicates that an invalid address was provided for a network operation, which is not valid in its current context.
Q: How can I prevent this error from occurring?
A: Ensure that all IP addresses and port numbers are correctly specified and compatible with the intended network operations. Validate parameters before passing them to network functions.
Summary
The WSAEADDRNOTAVAIL error is a specific error code in the Windows Sockets API, indicating an invalid address provided for a network operation. By understanding its causes and following best practices for parameter validation and context review, developers can effectively manage this error and ensure robust network communication in their applications.