Salesforce datasource - URL_NOT_RESET

Symptoms

Executing SOQL queries shows:

Error code: URL_NOT_RESET

Error message: Destination URL not reset. The URL returned from login must be set

Cause

This error occurs usually when datasource Url does not contain the real Salesforce domain but the value like test.salesforce.com or login.salesforce.com

Resolution

Update datasource configuration and put your real domain value, accessible from Salesforce Settings / Company Settings / My Domain into the Salesforce URL field.