Why Am I Getting a 'java.net.SocketException: Connection reset' Error on the Server Side Even Though the Client Shows No Closure?

Understanding "java.net.SocketException: Connection reset" Error

When reading from a socket, you may encounter the "java.net.SocketException: Connection reset" error. This arises when the client side of the connection abruptly closes the connection. However, you mentioned it's you (the server) experiencing the error while the client logs indicate no closure.

Possible Causes of the Error:

1. Intentional Connection Reset: Rarely, clients intentionally close the connection in an unusual manner, leading to this error.
2. Application Protocol Error: It often indicates that the server attempted to write to a connection the client had already closed.
3. Closing a Socket with Unread Data: Prematurely closing a socket with unread data in the receive buffer can trigger this error.
4. Windows-Specific Connection Aborts: In Windows, network issues originating from the server can cause connection aborts without a "connection reset" message.
5. Windows Socket Closure on Process Exit: Unlike Unix systems, Windows will reset a connection if a process terminates without properly closing a socket.

Additional Considerations:

You mentioned using socket.setSoTimeout(10000) before readInt(). While this is not typically a direct cause of the error, it may have contributed to it in your specific scenario. Leaving a breakpoint in your IDE might have also influenced the error's appearance.

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