Common error codes
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The following table lists error codes common to the IoT Hub REST APIs.
Common error codes
| Error code | Description | HTTP status code |
|---|---|---|
| 400 | The body of the request is not valid; for example, it cannot be parsed, or the object cannot be validated. | 400 Bad format |
| 401 | The authorization token cannot be validated; for example, it is expired or does not apply to the request’s URI and/or method. | 401 Unauthorized |
| 404 | The IoT hub instance or a device identity does not exist. | 404 Not Found |
| 403 | The maximum number of device identities has been reached. | 403 Too many devices |
| 412 | The etag in the request does not match the etag of the existing resource, as per RFC7232. | 412 Precondition failed. |
| 429 | This IoT hub’s identity registry operations are being throttled by the service. For more information, see IoT Hub Developer Guide – Throttling for more information. An exponential back-off strategy is recommended. | 429 Too many requests |
| 500 | An internal error occurred. | 500 Internal Server Error |