Gave up (rejected at the QUIC layer with INTERNAL_ERROR) instead of recovering.
The client did something the clause forbids, or failed to do what it requires.
What was measured
- Client
- ngtcp2 — ngtcp2 + nghttp3 (direct), 3c23148
- Test
- 0-RTT rejected after the client sends early data —
q-zero-rtt-reject - Clause
- RFC 9001 §4.6.2 (MUST)
- Class
- resilience — Recovered rather than giving up.
- Required behaviour
- Reset the state of every stream, including application state bound to them. Section 4.6.2 requires the reset because a rejected 0-RTT means every assumed connection characteristic may have been wrong. It does not require retransmission, which is the application concern, not QUIC's. This port issues tickets that advertise early data and then declines every offer, so a resuming client sends 0-RTT and always has it refused. The handshake itself completes normally.
- Measured
- 2026-10-27
Reproduce it
The suite is the judge, so the reproduction is to point the same client at the same test and let the server report what it saw.
SESSION=$(curl -sX POST https://conformance.pqcrypta.com/session | jq -r .id)
# then drive ngtcp2 at the test URL and read the verdict:
curl -s https://conformance.pqcrypta.com/report/$SESSION.json | jq '.results["q-zero-rtt-reject"]'