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Health probes (probe_health/refresh_health) are type-aware: WireGuard checks the last WG handshake timestamp, OpenVPN checks the tun/tap interface, Tor checks the control-port GETINFO, and sshuttle/proxy types do a TCP reachability probe to the remote endpoint. Results are persisted via set_connection_status and wired into the health_monitor_loop so the UI always has a current health snapshot without polling. Per-peer fail-open semantics: VPN, SSH, and proxy connections default to fail-closed (kill-switch stays active even when the tunnel is down). Tor defaults to fail-open. The default can be overridden per-peer via set_peer_failopen/effective_failopen. apply_routes skips the fwmark and kill-switch rules for any fail-open peer whose connection health is not "working", letting traffic fall back to direct routing transparently. New generic admin-only connection CRUD endpoints (GET/POST/PUT/DELETE /api/connectivity/connections, GET /<id>/health, PUT /api/connectivity/peers/<peer>/failopen) are guarded by the existing admin role check. connection.create, connection.update, connection.delete, and peer.failopen are all registered in ROUTE_ACTION_MAP for the audit hook so every change is recorded in the owner-visible change log. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>