HP Jet Direct “Bad Gateway” error DHCP

If you have an old HP Jet Direct card (perhaps an old dot matrix printer) and you’re looking to move from static IP configuration to DHCP you’ll want to telnet into the device and change the settings that way. I am not going into detail about how to do it because the menu is very basic to navigate via the CLI. Just know that you’re better off using telnet to access the menu-driven CLI as “root” and you’ll be happy.