redis/redis-py · error · ConnectionError

no certificates found for the responder

Error message

no certificates found for the responder

What it means

Error "no certificates found for the responder" thrown in redis/redis-py.

Source

Thrown at redis/ocsp.py:97

    responder_hash = ocsp_response.responder_key_hash

    cert_to_validate = issuer_cert
    if (
        responder_name is not None
        and responder_name == issuer_cert.subject
        or responder_hash == issuer_hash
    ):
        cert_to_validate = issuer_cert
    else:
        certs = ocsp_response.certificates
        responder_certs = _get_certificates(
            certs, issuer_cert, responder_name, responder_hash
        )

        try:
            responder_cert = responder_certs[0]
        except IndexError:
            raise ConnectionError("no certificates found for the responder")

        ext = responder_cert.extensions.get_extension_for_class(x509.ExtendedKeyUsage)
        if ext is None or x509.oid.ExtendedKeyUsageOID.OCSP_SIGNING not in ext.value:
            raise ConnectionError("delegate not authorized for ocsp signing")
        cert_to_validate = responder_cert

    if validate:
        _verify_response(cert_to_validate, ocsp_response)
    return True


def _get_certificates(certs, issuer_cert, responder_name, responder_hash):
    if responder_name is None:
        certificates = [
            c
            for c in certs
            if _get_pubkey_hash(c) == responder_hash and c.issuer == issuer_cert.subject
        ]

View on GitHub (pinned to da03cdc7e8)

When it happens

Trigger: Thrown at redis/ocsp.py:97 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of redis/redis-py@da03cdc7e8 (2026-08-04). Data as JSON: /data/errors/40f60b81cdc31133.json. Report an issue: GitHub.