Winsock Error 10054: Connection Reset by Peer

Winsock Error 10054 is a Windows socket error that occurs when an existing TCP connection is forcibly closed by the remote host. This means the connection was terminated unexpectedly without completing the normal TCP shutdown handshake.

Instead of the standard TCP disconnection sequence (FIN, FIN-ACK, ACK), the remote host sends a reset (RST) flag, which immediately aborts the connection.

Common reasons for this include:

• The remote device was stopped, restarted, or lost network connectivity.
• The remote host performed a hard close of the connection. IPWorks does not initiate a hard close unless the Linger property (IPPort, IPDaemon) is explicitly set to false.
• A half-open connection occurred, where one side stops receiving acknowledgments or receives invalid sequence or acknowledgment numbers, causing a reset. This may result from misconfigured firewalls or proxies, or poor network conditions leading to dropped packets.

Understanding these scenarios can help diagnose and resolve connection reset issues in TCP-based applications.