> For the complete documentation index, see [llms.txt](https://developers.docs.bantufoundation.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.docs.bantufoundation.org/api/errors/http-status-codes/horizon-specific/stale-history.md).

# Stale History

A Horizon server may be configured to reject historical requests when the history is known to be further out of date than the configured threshold.

In such cases, the `stale_history` error occurs and returns a [`503` error code](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/503). To resolve this error (provided you are the Horizon instance’s operator), please ensure that the ingestion system is running correctly and importing new ledgers.

```bash
{
  "type": "https://expansion-testnet.bantu.network/horizon-errors/stale_history",
  "title": "Historical DB Is Too Stale",
  "status": 503,
  "detail": "This horizon instance is configured to reject client requests when it can determine that the history database is lagging too far behind the connected instance of stellar-core.  If you operate this server, please ensure that the ingestion system is properly running."
}
```