msquic — Version Negotiation offering a reserved version alongside v1

Pass

Responded correctly: sent Version Negotiation for 1 datagram(s); the client did not persist with an unsupported version.

The client did what the clause requires.

What was measured

Client

msquic — .NET HttpClient + msquic, 2.7.0

Test

Version Negotiation offering a reserved version alongside v1 — q-version-negotiation

Clause

RFC 9000 §6 (MUST)

Class

correctness — Rejected something invalid, with the code the RFC names.

Required behaviour

Abandon the connection attempt, or retry with a version both ends support. §6.2 requires a client that supports only one version to abandon it rather than persist.

Measured

2026-09-18

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=$(curl -sX POST https://conformance.pqcrypta.com/session | jq -r .id)
# then drive msquic at the test URL and read the verdict:
curl -s https://conformance.pqcrypta.com/report/$SESSION.json | jq '.results["q-version-negotiation"]'