Error Code Portal
MicrosoftWindows Win32Error code

10057

WSAENOTCONN

Alternative forms: 0x00002749 · 0x2749 · WSAENOTCONN · 0x80072749

What does this code mean?

Code 10057 · An issue reported by Windows Win32.

Official explanation · Original text

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 call) no address was supplied.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

System Error Codes (9000-11999) (WinError.h) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

Source details · Original licenses and notices