Tunnel a local port to a specific Fly Machine with fly proxy (WireGuard)
domain: fly.io · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Run `fly proxy <local:remote> -a <app>`, e.g. `fly proxy 9000:8080 -a myapp`, to forward localhost:9000 to port 8080 on the app's default first Machine.
To target a specific remote host pass it as the optional third argument: `fly proxy 9000:8080 <host> -a <app>` where <host> can be a `<machine_id>.vm.<app>.internal` hostname or an IPv6 6PN address.
Adjust local binding with `-b, --bind-addr` (default 127.0.0.1); scope with `-o, --org`; interactively choose a Machine with `-s, --select`.
fly proxy automatically establishes/uses a WireGuard tunnel to reach the Machine, so a single-port tunnel needs no separate VPN setup.
Keep the process running for the life of the tunnel; `--watch-stdin` makes it exit once stdin closes.
Known gotchas
Default connects to the FIRST Machine returned by the app's internal DNS - for a specific machine always pass the remote host or use --select.
It binds to 127.0.0.1 by default, so the forwarded port is only reachable locally unless you change --bind-addr.
The tunnel lives only while the command runs; it is not persistent and does not daemonize.
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