What causes RestSourceCallFailed?

The REST API returned a non-success HTTP status code (4xx or 5xx). The API authentication token or API key is expired or invalid. The pagination settings in the REST source dataset do not match the actual API pagination behavior. The REST endpoint is temporarily down or rate-limiting the integration runtime IP

How do I fix RestSourceCallFailed?

Check the ADF activity run output for the HTTP status code and response body from the REST source.. Verify the linked service authentication credentials are valid and have not expired.. Test the REST endpoint URL with the same authentication from a browser or Postman to confirm it is reachable.. Review the REST source pagination configuration — verify the pagination rule type and relative URL match the API.. If rate-limited (HTTP 429), add a retry policy with a delay to the copy activity.

High severitydata source

Power BI Refresh Error:
RestSourceCallFailed

What does this error mean?

An ADF copy activity reading data from a REST API endpoint (REST source) received an error response. The HTTP GET/POST call to the source REST API failed.

Common causes

1The REST API returned a non-success HTTP status code (4xx or 5xx)
2The API authentication token or API key is expired or invalid
3The pagination settings in the REST source dataset do not match the actual API pagination behavior
4The REST endpoint is temporarily down or rate-limiting the integration runtime IP

How to fix it

1Check the ADF activity run output for the HTTP status code and response body from the REST source.
2Verify the linked service authentication credentials are valid and have not expired.
3Test the REST endpoint URL with the same authentication from a browser or Postman to confirm it is reachable.
4Review the REST source pagination configuration — verify the pagination rule type and relative URL match the API.
5If rate-limited (HTTP 429), add a retry policy with a delay to the copy activity.

Frequently asked questions

Does this error affect all pipeline runs or just the current one?

Depends on the root cause. A persistent misconfiguration fails every run; a transient issue may resolve on retry. Check the run history.

Can this error appear in Azure Data Factory and Microsoft Fabric pipelines?

Yes — the same connector errors appear in both ADF and Fabric Data Factory pipelines.

How do I see the full error detail for an ADF pipeline failure?

In ADF Monitor, click the failed run, then the failed activity. The detail pane shows the error code, message, and sub-error codes.

Will downstream Power BI datasets be affected when an ADF pipeline fails?

Yes — a dataset refreshing after the pipeline will use stale data or fail if the target table was cleared. The Power BI refresh may succeed while serving wrong data.

Official documentation: https://learn.microsoft.com/en-us/azure/data-factory/connector-troubleshoot-rest