I have always been able to print to my HP Officejet Pro 8600 Plus via WiFi from my desktop (Dell XPS 8700 Intel i7-4790 CPU @ 3.60GHz 16.0 GB RAM, Windows 10 version 1903 64-bit op system), laptop (HP Pavilion Intel i5-7200U CPU @ 2.50GHz 12.0 GB RAM, Windows 10 version 1809 64-bit op system, and smartphone (Samsung Galaxy S8+). However, when I turned on Webroot WiFi Security on all 3, none of them would print. When I disconnected them, they all printed. I do have my Trusted WifI Network selected for all 3. Turning off the Kill Switch had no effect. In order to print, I must disconnect Webroot WiFi Security. I have two netfilter.access.logs and one service.log available to email to you if you need them.