Windows error 10057 (WSAENOTCONN): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: WSAENOTCONN a request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto.

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WSAEISCONN	WSAESHUTDOWN

WSAENOTCONN

WSAENOTCONN means that an operation requiring a connected socket was attempted when no connection exists. It is often a socket state-management error rather than a network failure.

Common causes

send or recv is called before a stream connection has completed.
A connectionless socket has no default peer, while the code uses send instead of sendto.
A connected UDP socket was disconnected by calling connect with an unspecified address.
Another part of the program closed or replaced the connection.

What to do

Make socket state explicit: created, bound, connecting, connected, shutting down, and closed. For datagrams, choose deliberately between a connected UDP socket and per-message destination addresses.

Microsoft: connect · Microsoft: recv

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