My nemesis, even at home.
My main printer was listed as offline this morning, so I tried to reconnect it via the setup software, and it kept telling me to check firewall settings.
I searched the internet for firewall settings and found and applied them, both on the new router and in Windows.
No dice.
I then decided to hardcode an IP address into the printer, and that’s where I found the problem: it was set to static IP, with no IP assigned to it. Whut?
So I set it to DHCP, restarted it, and it connected.
I hate network printers.