Windows error 10013 (WSAEACCES): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Winsock denied a socket operation because the address, binding, or option was not permitted locally.

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WSAEBADF	WSAEFAULT

WSAEACCES

WSAEACCES is a local policy or permission failure, not a response from the remote peer. It is commonly seen when an application tries to send to a broadcast destination without enabling SO_BROADCAST, or when a bind conflicts with an address that Windows treats as exclusively reserved.

What distinguishes it from address-in-use errors

WSAEADDRINUSE normally means the selected endpoint is already occupied. WSAEACCES means the operation itself is forbidden in the current configuration. For example, a broad socket reuse setting does not override an excluded port range or another component's exclusive ownership of the address.

Useful checks

Log the local address, port, protocol, socket options, and whether the call was bind, connect, send, or sendto.
For broadcast traffic, enable SO_BROADCAST deliberately and verify that the destination is really intended to be broadcast.
For bind failures, inspect excluded port ranges, listeners, service reservations, and exclusive-address options before adding blind retries or reuse flags.

Microsoft: send · Microsoft: excluded-port bind failure · The Open Group: socket options and endpoints

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