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How to Fix WSAEWOULDBLOCK Resource Temporarily Unavailable Error


How to Fix WSAEWOULDBLOCK Resource Temporarily Unavailable Error

If you are trying to connect to a network socket in Windows and you get the error code WSAEWOULDBLOCK, it means that the operation cannot be completed immediately because the socket is busy or there is no buffer space available. This error is usually caused by a non-blocking socket mode, which means that the socket does not wait for the data to be sent or received, but returns immediately with an error if the operation cannot be performed.


There are a few possible solutions to fix this error and resume your network communication. Here are some of them:

  • Check your firewall settings. Sometimes, your firewall may block or limit the network traffic on certain ports or protocols, causing the WSAEWOULDBLOCK error. You can try to disable your firewall temporarily or add an exception for the application or service that is using the socket. You can also check the firewall logs to see if there are any blocked or dropped packets.

  • Adjust your socket options. You can use the setsockopt function to change some parameters of your socket, such as the buffer size, the timeout value, or the blocking mode. For example, you can increase the buffer size to allow more data to be stored in the socket before sending or receiving it. You can also set a timeout value to specify how long the socket should wait for an operation to complete before returning an error. Alternatively, you can switch to a blocking mode, which means that the socket will wait until the data is sent or received, or an error occurs.

  • Retry the operation later. Sometimes, the WSAEWOULDBLOCK error may be temporary and resolve itself after a short period of time. You can use the select function to monitor the status of your socket and check if it is ready for reading or writing. You can also use the WSAGetLastError function to get more information about the error and handle it accordingly.

In conclusion, the WSAEWOULDBLOCK error is a common network error that occurs when a socket operation cannot be completed immediately. You can fix it by checking your firewall settings, adjusting your socket options, or retrying the operation later. If none of these solutions work, you may need to contact your network administrator or service provider for further assistance.




WSAEWOULDBLOCK is an error code that stands for "Resource temporarily unavailable". It is defined in the Winsock.h header file, which is used for Windows socket programming. Winsock is a standard interface for network communication in Windows, based on the Berkeley sockets model.

WSAEWOULDBLOCK indicates that a socket operation cannot be completed immediately because the socket is in a state where it cannot accept new data or send out data. This can happen for various reasons, such as:

  • The socket is non-blocking and the operation would block.

  • The socket is blocking and the operation would take too long to complete.

  • The socket has reached its maximum buffer capacity and there is no more space to store data.

  • The socket is connected to a remote host that is slow or unreachable.

  • The socket is affected by network congestion or interference.

When a socket operation returns WSAEWOULDBLOCK, it does not mean that the operation has failed permanently. It only means that the operation cannot be performed at the moment and needs to be retried later when the socket is ready.


There are some best practices that you can follow to prevent or minimize the occurrence of WSAEWOULDBLOCK errors in your network applications. Here are some of them:

  • Use asynchronous sockets. Asynchronous sockets are sockets that do not block the main thread of your application when performing network operations. Instead, they use callbacks or events to notify you when the operation is completed or an error occurs. This way, you can avoid blocking your application and handle the WSAEWOULDBLOCK error more easily.

  • Use multiple threads or processes. If you use synchronous sockets, you can use multiple threads or processes to handle different socket operations concurrently. This way, you can avoid blocking your application and distribute the workload among different resources. However, you need to be careful with thread synchronization and resource sharing issues.

  • Use appropriate buffer sizes. You can use the getsockopt and setsockopt functions to get and set the buffer sizes of your sockets. You should use buffer sizes that are large enough to accommodate the expected amount of data, but not too large to waste memory or cause performance issues. You should also monitor the buffer usage and adjust it dynamically if needed.

  • Use appropriate timeout values. You can use the setsockopt function to set the timeout values of your sockets. You should use timeout values that are reasonable for your application and network conditions, but not too short to cause frequent errors or too long to cause delays. You should also handle the timeout errors gracefully and retry the operation if needed.

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