An empty 404 is itself information: it says something terminates TLS here and
chose not to answer. The console and the websocket endpoint now close the
connection instead, which is what a hostname that serves nothing looks like.
The websocket endpoint answers a genuine upgrade — verified live, 101 — and
nothing else; a browser opening it gets a closed connection.
Reviewing that turned up two holes that mattered more than the thing being
reviewed.
The compose defaults published the application and Reverb on every interface.
Docker publishes ports ahead of UFW, so those backends were reachable from the
internet with the firewall closed — and reaching a backend directly skips the
proxy, and with it every hostname and address rule keeping the console private.
The defaults are loopback now, and an update rebinds an existing installation
that is behind a proxy actually running and holding 443. A development box
without one is left alone, because taking its port away would look like the
machine had broken.
And the console's own "open" switch was emitting 0.0.0.0/0 into the proxy's
allowlist. One click would have put the console on the public internet, which
is the exact state the owner's rule exists to prevent. Switching it off relaxes
the application's check; the proxy keeps its list, always.
The reference proxy config carries the arrangement: QUIC early data off, since
an address-based decision taken on 0-RTT can answer 425 and some browsers do
not retry — an intermittent lockout from the console is the worst kind — and
explicit handling for plain HTTP, whose automatic redirect otherwise announces
both hidden names to anyone who asks.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude
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