Clicking the NPrinting ON-Demand button customer gets the following pop-up message: NPrinting service error. Please check if NPrinting service is reachable. HttpEvent: An error ocurred while using SSL configuration for endpoint 0.0.0.0:9001.

NPrinting On-Demand report button no longer works in all our Qlikview Dashboards. Upon clicking the button we get the following pop-up message:
NPrinting service error. Please check if NPrinting service is reachable.

Every time the report button is clicked they get 4 error messages in the Windows Event Viewer of the Nprinting Server:
HttpEvent: An error ocurred while using SSL configuration for endpoint 0.0.0.0:9001. 

WARN NPrinting.OnDemand.ServiceStarter - IMPORTANT. Since SSL has been activated for HTTP endpoint, make sure that an SSL certificate has been configured for address https://servername:9001. See official documentation for details.

• Remove old SSL Associations
• Generated new GUI
• Binding an SSL Certificate to a URL
• NPrinting Server service restart

The official documentation stated in the ON-Demand log can be found here: 
https://community.qlik.com/t5/Qlik-NPrinting-Documents/How-to-Enable-SSL-in-On-Demand/ta-p/1486485

In this particular case customer did: 

• Remove old SSL Associations -> netsh http delete sslcert ipport=0.0.0.0:9001 
• Generated new GUI
• Binding new SSL Certificate -> netsh http add sslcert ipport=0.0.0.0:9001 certhash="<thumbprint from *.domainname.local certificaat>" appid=<generated GUID>
• NPrinting Server service restart.