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description: This page describes the Data source is unavailable DataLens On-premises error.
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# [DataLens On-premises] Data source is unavailable

`ERR.DS_API.DATABASE_UNAVAILABLE`

The database data source is not available.

The possible causes might include the following:
- Network failures.
- No access from the DataLens server to the source network.
- The source has been disconnected.
- The source needs to be fine-tuned.