HRESULT 0x80090333 (SEC_E_UNFINISHED_CONTEXT

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A security context was deleted before the context was completed. This is considered a logon failure.

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SEC_E_SECURITY_QOS_FAILED	SEC_E_NO_TGT_REPLY

SEC_E_UNFINISHED_CONTEXT_DELETED

SEC_E_UNFINISHED_CONTEXT_DELETED means that code deleted a security context before authentication negotiation finished. SSPI reports this as a logon failure, but the underlying problem is generally local context lifetime management.

Typical race

One path abandons a connection after a timeout or transport error while another path is still handling the next handshake token. The cleanup destroys the context, and the remaining handshake call observes the deleted state.

How to prevent it

Assign one owner for the context state machine.
Serialize teardown with all pending handshake work.
On failure, free a partial context only after no caller can access it again.

Microsoft: AcceptSecurityContext (General) · SSPI Status Codes

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