I can add to that threath that I've seen a problem accessing a printer through HTTP or HTTPS after changing the IP from DHCP to Static.
There is no answer from HTTP even though XDM is reporting that HTTP is enabled. What I've seen is that the ports are closed. This is why the printer is not communicating. (nmap was used to scan the ports)
Cycling the power or cycling the HTTP protocol on and off sometimes works but not all the time. ALTBOOT is required as a final solution.