The companion reaches the node at its fips0 ULA, and the web UI builds app
links as http://[<ULA>]:<direct port> — but rootless-podman published ports
bind 0.0.0.0 only, so every app URL was refused over the mesh (:8334 first).
A reconcile loop in the backend mirrors public IPv4 listeners: any port
>=1024 on 0.0.0.0 without an IPv6 any-listener gets a v6-ONLY [::] forwarder
to 127.0.0.1, following /proc/net/tcp* so install/remove and hardcoded
companion ports are covered without touching a single container. Purely
additive: IPv4/LAN/Tor access paths are untouched, v6only listeners cannot
collide with or intercept v4 traffic, and foreign IPv6 listeners win.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>