Tunnel a local port to a Fly Machine with fly proxy
domain: fly.io · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Make sure flyctl is authenticated so the WireGuard (6PN) connection is available; `fly agent` or auth handles the tunnel peer.
Run `fly proxy <local_port>:<remote_port> -a <app>` (e.g. `fly proxy 5432:5432 -a myapp`) to forward localhost:<local_port> to the remote service on each running Machine.
Use it to reach services that are NOT publicly exposed (internal 6PN services, databases, admin panels) from your local machine.
Add `-r <region>` to target Machines in a specific region, or `--select` to pick an instance.
Leave the command running in a foreground terminal (or background it); it stays connected until you stop it.
Official docs: https://fly.io/docs/flyctl/proxy/ and https://fly.io/docs/networking/app-services/
Known gotchas
fly proxy runs in the foreground and keeps the WireGuard tunnel up — don't let it exceed your automation timeout, or run it as a managed background process.
The service must bind the right address in the VM: for public services bind 0.0.0.0:<port>; for private/internal access bind fly-local-6pn:<port>.
UDP services need the app to bind a special address (fly-global-services) and are proxied differently.
Proxying to a machine that is stopped/autostopped will fail until it's started.
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