What does Windows error code 10107 (WSASYSCALLFAILURE) mean?

WSASYSCALLFAILURE

WSASYSCALLFAILURE is deliberately generic. Microsoft uses it for local system calls that are expected not to fail and for provider failures where the provider did not supply a meaningful extended Winsock error.

Examples of the failure class

The Winsock documentation mentions failures in event-waiting or registry operations used while manipulating protocol and namespace catalogs. It can also indicate a service provider implementation defect when the provider returns failure without setting a specific error.

How to make the code actionable

• Capture the exact Winsock API and call stack; the code alone does not identify the failed subsystem.
• Call WSAGetLastError immediately, before another Winsock call overwrites the thread-local error.
• Record the selected protocol or namespace provider and provider catalog entry.
• Collect provider-specific logs and Windows event data around catalog or DLL failures.

Do not automatically retry every operation on this code. If the provider repeatedly returns a generic failure for the same input, retry can hide a deterministic implementation or catalog problem. First isolate whether the base provider reproduces the failure.

Microsoft: Winsock error codes · Microsoft: WSAGetLastError · Microsoft: handling Winsock errors

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