When licensing a Qlik Sense Enterprise on Windows installation, a message is printed at the bottom of the screen:
With a signed license key, you need internet access (direct or through a proxy) to access the cloud-based license backend, for user assignments, analytic time consumption, and product activations.
This is not an error message or warning but meant to provide information.
If no errors were thrown on-screen during the licensing process, and if the serial number is visible under the signed license key, then the licensing has succeeded.
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How To Apply A License to Qlik Sense Server