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HTTP_STATUS_HANDSHAKE_FAILED
The failure occurs before HTTP request processing. Common causes include unsupported TLS versions or ciphers, a server that terminates the handshake, or TLS configuration that differs across origin nodes.
Test the origin TLS endpoint directly with the intended SNI name, inspect handshake logs, and compare all backend nodes. A packet capture may be necessary because the failure can happen below HTTP logging.
Operational meaning of HTTP 525 for HTTP_STATUS_HANDSHAKE_FAILED
HTTP 525 (HTTP_STATUS_HANDSHAKE_FAILED) is a server-error response. AllStat records its meaning as “525 SSL Handshake Failed”. For HTTP_STATUS_HANDSHAKE_FAILED, interpret it with the request method, selected representation, response headers, and the specification or product that defines the code; the number alone does not prove that application work completed.
Client and server handling for HTTP_STATUS_HANDSHAKE_FAILED
- Correlate HTTP_STATUS_HANDSHAKE_FAILED with origin, gateway, load-balancer, and dependency logs to locate which hop generated it.
- For HTTP_STATUS_HANDSHAKE_FAILED, record request and trace identifiers, upstream timing, retry count, and the health of the selected backend.
- For HTTP_STATUS_HANDSHAKE_FAILED, use bounded retries with backoff only for idempotent work and only when the service policy permits them.
For telemetry, record HTTP 525, method, authority, route template rather than secrets, response headers relevant to caching or retry, latency, upstream identity, and whether the response originated at the application or an intermediary.
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