What does errno 108 (ECONNRESET) mean?

ECONNRESET

ECONNRESET means an established or partially established connection was reset instead of closing cleanly. It does not identify why the reset occurred. A peer application, a load balancer, a firewall, a proxy, a transport implementation, or a protocol violation can all produce an abrupt reset at different layers.

On Windows socket APIs, obtain WSAECONNRESET through WSAGetLastError(); do not expect Winsock to write this UCRT errno macro. For stream sockets, a reset is distinct from recv returning zero after a graceful peer shutdown.

Evidence for a reset investigation

• Record whether the error occurred on connect, send, receive, or asynchronous completion, together with connection age and byte counts in both directions.
• Preserve protocol phase and last complete message. A reset during a handshake points to a different class of causes than a reset after idle time.
• Correlate with server, proxy, and firewall logs using timestamps and connection identifiers where available.
• Treat the socket as failed. A retry requires a new connection and an application-level decision about whether the interrupted request is safe to repeat.

References

• Microsoft: recv()
• Microsoft: recvfrom()
• Microsoft: Winsock error retrieval

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