By default, the Qlik Sense proxy is installed and configured using SSL, and uses a default untrusted or unsigned certificate. You may receive a notification about the certificate or connection not being trusted, this message will vary with each browser. This is normal, just select either accept, understand, install, or trust the certificate and choose to continue to “this site”. You may need to Add and/or Confirm the certificate in other browsers. You may have to perform this action twice.
As a post installation step, you can choose to enable HTTP and deactivate HTTPS in the Qlik Management Console Proxy settings, OR install your own trusted certificate. Refer to the Help Site documentation (http://help.qlik.com/ ) at the following topic location to learn more: Administering Qlik Sense > Managing a Qlik Sense site > Configuring Qlik Sense > Configuring security > Changing proxy certificate