HRESULT 0x801901F8 (HTTP_E_STATUS_GATEWAY

Status / error code:

Category:

Constant name:

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Facility:

Operating System:

Description:

The gateway or proxy returned HTTP 504 Gateway Timeout after waiting for an upstream response.

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HTTP_E_STATUS_SERVICE_UNAVAIL	HTTP_E_STATUS_VERSION_NOT_SUP

HTTP_E_STATUS_GATEWAY_TIMEOUT

HTTP_E_STATUS_GATEWAY_TIMEOUT maps to HTTP 504 Gateway Timeout. A server acting as a gateway or proxy did not receive a timely response from the upstream server it needed to contact.

What to check

Identify which hop generated the response by inspecting gateway headers, logs, and request IDs.
Compare client, load balancer, reverse-proxy, and application timeout budgets; the shortest limit often determines the observed failure.
Check upstream latency, connection-pool exhaustion, DNS resolution, TLS handshakes, and dependency timeouts.

RFC 9110: 504 Gateway Timeout

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