I have the same problem. As far as I am aware, I altered nothing significant in printer or lan settings. Recently I found I was unable to print (wireless) to my main printer on the LAN. All attempts to reconfigure the security settings have had no results.
For the moment, I have given up. I use my local computer , on a usb connection, or take the required stuff though to the computer where the main, and superior printer sit and print from there.
A couple of fixes on the web, concerning a recent Microsoft security update, were tried, but did nothing.