# hook_unavailable

> The pre-trade hook didn't give a valid answer. The hook fails closed, so the order wasn't sent.

Source: https://tickwire.io/docs/errors/hook_unavailable/

HTTP 503. Nothing reached the broker.

**Likely cause:** The hook URL is down, slow or answered invalidly.

**What to do:** Fix the hook, then send the order again.

**Retry:** Yes. Nothing happened (or it was a read), so repeat it, after `Retry-After` when present.

Listed under [Pre-trade hooks, holds and kill switches](https://tickwire.io/docs/errors/#pre-trade-hooks-holds-and-kill-switches) in [Errors](https://tickwire.io/docs/errors/). Send the error's `requestId` to support and we can find the request.