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High severitydata source

Power BI Refresh Error:
KustoWriteFailed

What does this error mean?

An ADF or Fabric pipeline failed to write data to Azure Data Explorer (Kusto). The write operation was rejected or failed during ingestion.

Common causes

  • 1Transient error during the write operation to Azure Data Explorer (Kusto)
  • 2Permanent configuration issue — wrong cluster URI, missing permissions, or schema mismatch between source and target table

How to fix it

  1. 1Check the full error message — KustoWriteFailed includes the underlying Kusto error detail.
  2. 2For transient failures: configure retry on the ADF copy activity (recommended: up to 3 retries).
  3. 3For permanent failures: review your linked service configuration (cluster URI, database name, authentication).
  4. 4If the error persists after checking configuration, contact Azure Data Explorer support.

Frequently asked questions

Does this error affect multiple datasets at once?

If multiple datasets connect to the same data source, yes — all of them will fail until the source connectivity is restored.

Can this error be caused by a server migration or rename?

Yes — if the server name, database name, or connection string changed (e.g., during a cloud migration), Power BI still holds the old connection details. Update the connection in Power BI Desktop and republish.

Does this error appear in Power BI Desktop?

Sometimes — if you open the .pbix file and attempt a refresh, Desktop will surface the same connection error. This is useful for debugging without affecting the Service dataset.

Will the error resolve automatically once the source is back online?

Only if it was a temporary outage. The next scheduled refresh will succeed automatically. If the connection string changed or credentials expired, manual intervention is needed.

Source · learn.microsoft.com/en-us/fabric/data-factory/connector-troubleshoot-azure-data-explorer

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