The most common root cause for this is that Qlik Data Transfer is currently installed on a machine which also hosts Qlik Data Gateway - Direct Access.
This is working as designed.
In a production deployment, it is recommended to deploy Qlik Data Transfer on a separate server instance, to avoid resource constraints with failed reloads or end-user errors as a consequence.
The data gateway software should be installed on a dedicated Window Server as stipulated in the System Requirements below. Do not install it on the actual data source server or on a server that already hasQlik Sense Enterprise on WindowsorQlik DataTransferinstalled.