No connection with Qlik NPrinting Server error occurs when On-Demand is clicked in the QlikView Access Point

I installed the Qlik NPrinting On-Demand add-on and configured the On-Demand settings on the Qlik NPrinting Server. When I click On-Demand in the QlikView Access Point, I get the error message "No connection with NPrinting server. Please check your network settings or contact the administrator."

Possible cause  

The Qlik NPrinting web console is not trusted because you have not logged in with the Qlik NPrinting services Window domain user, and accepted the certificate.

Proposed action  

Log into the Qlik NPrinting web console using the Qlik NPrinting services Window domain user and accept the certificate.