# 63117: Downstream Service Unavailable at the moment

Log Type: TWILIO

Log Level: ERROR

## Description

This error means Twilio could not complete the request because one or more downstream services were unavailable and the request returned a 503 response. A 503 response indicates the service is temporarily unavailable.

### Possible causes

* A downstream dependency was down or experiencing a transient issue when Twilio processed the request.
* A temporary Twilio service unavailability prevented the request from completing.

### Possible solutions

* Retry the request after a short delay. Twilio treats 503 as a temporary service unavailability and recommends trying again later.
* Check the `Error Logs` in the Twilio Console for the affected request, timestamp, and resource SID so you can confirm where the failure occurred.
* If this happens during WhatsApp sender creation or registration, set up an `Alarm` or `Event Stream` to track repeat failures and capture the error log details.

#### Additional resources

* [Debugging Tools](/docs/messaging/guides/debugging-tools)
* [Senders API - WhatsApp](/docs/whatsapp/api/senders)