> ## Documentation Index > Fetch the complete documentation index at: https://docs.aciona.me/llms.txt > Use this file to discover all available pages before exploring further. # The webhook returned an error > What each response code means and how to fix it. The ingestion endpoint answers with specific codes. Each points at a different cause. ## 401 — invalid token The `X-Aciona-Token` header is missing, has the wrong value, or belongs to another source. It must be exactly `X-Aciona-Token`. Some UIs prepend a prefix to custom header names — verify the value that actually goes out. Each source has its own token. A token that is valid for another source produces `401`. Rotation invalidates the previous token immediately. Update the external tool. Nothing is persisted on a `401` request. There is no alert record to inspect afterwards. ## 403 — inactive source The source exists and the token is right, but the source is **deactivated**. Re-activate it under **Alert sources**. ## 404 — source not found The identifier in the URL matches no source. Common causes: * The source was deleted. * The URL was copied partially, or with a space or line break. * Part of the path is missing: the correct URL is `https://ingress.aciona.me/webhooks/`. ## 400 — invalid payload The body is not valid JSON, or required fields for that source type are missing. Confirm the `Content-Type: application/json` header and that the body is well-formed JSON. Templates with unescaped quotes break the JSON — validate the rendered output, not the template. `triggerId` and `name` are required. Check the `{EVENT.TRIGGERID}` and `{EVENT.NAME}` macros in the media type parameters. `alarmName` and `alarmArn` are required in the canonical payload. Check that the Lambda is receiving the expected SNS message. The payload must contain the `alerts` array. A manual test POST without it is rejected by a source of those types. ## 413 — payload too large The body exceeded the limit (1 MB by default). Trim the fields sent in the template — Datadog and New Relic payloads can get enormous when they include snapshots or the full details object. ## 429 — too many requests The origin is sending alerts faster than allowed. Group alerts in the tool itself (`group_by` and `group_interval` in Alertmanager, grouping in Grafana) instead of sending one POST per series. ## 5xx — error on the aciona.me side Rare. Most tools retry automatically on `5xx`. If it persists, contact support with the time and the source identifier.