corrosion-nginx reported (unhealthy) despite serving the panel fine: nginx listens 0.0.0.0:80 (IPv4 only, no listen [::]:80), but 'localhost' resolves to ::1 first inside the container, so the probe got connection-refused. Verified: 127.0.0.1:80 serves the SPA. Probe now targets IPv4 explicitly. No nginx config change — the panel was never broken, only the healthcheck's hostname resolution. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>