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STATUS_NO_SECURITY_CONTEXT
The required security context is missing
SSPI protocols build a security context by exchanging opaque tokens between peers. This status means a later operation was attempted without the context that should have been established by InitializeSecurityContext and AcceptSecurityContext.
It is most useful for state-machine bugs and connection lifetime issues. A stale handle, failed handshake, replayed token, wrong connection association or cleanup race can all leave the caller with no valid context.
What to inspect
- Check whether the authentication handshake completed before application data was sent.
- Verify that context handles are not reused after deletion or across connections.
- Capture SSPI return codes from each InitializeSecurityContext or AcceptSecurityContext step.
References
- Microsoft: InitializeSecurityContext with Negotiate
- Microsoft: AcquireCredentialsHandle
- Microsoft Open Specifications: MS-KILE
- Microsoft Open Specifications: NTSTATUS values
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