This article describes how to resolve the NPrinting connection verification error:
x Qlik NPrinting webrenderer can reach Qlik Sense hub error
NPrinting: all versions
Qlik Sense: all versions
multi-node QS proxy environment
NLB (Network Load Balancer or Alias URL) server address used in front of cluster of Qlik Sense proxy nodes (which are linked to a Virtual Proxy. Proxy nodes will not work with NPrinting unless they are linked to a QS virtual proxy)
Although it is possible to use an NLB address in front of your QS proxy nodes that are used by NPrinting, the error generated in the NP connection verification process will appear as described in the article title
This error can safely be ignored as this does not affect generation of NPrinting connections
To eliminate the 'error' message, you would need to update your NPrinting connection to use a virtual proxy node address/computer name behind the NLB address . It must be the computer name and not an alias url).
The proxy node used must be linked to a virtual proxy with the following required attribute
Microsoft WindowsNTML authentication on the Qlik Sense proxy. (SAML and JWT are not supported. If your virtual proxy uses SAML or JWT authentication, you need to add a new virtual proxy with NTLM enabled for Qlik NPrinting connections).