> ## Documentation Index
> Fetch the complete documentation index at: https://developers.stellar.org/llms.txt
> Use this file to discover all available pages before exploring further.

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 A Horizon server may be configured to reject historical requests when the history is known to be further out of date than the configured threshold.

A Horizon server may be configured to reject historical requests when the history is known to be further out of date than the configured threshold.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

```json Example Response for a 'Stale History' Status Code theme={"theme":{"light":"github-light","dark":"github-dark"}}
{
  "type": "https://stellar.org/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."
}
```