The DNS listeners bind TCP and UDP on one port, and the harness probed TCP only. Under a full parallel run the port could be one another test's ephemeral UDP client socket held, the listener failed to bind, and the queries saw connection refused. That made TestConsoleEditsReachTheResolver fail once in a full suite and pass 12 of 12 on its own. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>