Fixing LaserJet network connectivity

I recently bought a used HP LaserJet P2015dn printer as a replacement for a Brother HL-2030. The Brother printer annoyed me with its sheer never-ending fan which came on even when only a single page was printed. I know these LaserJet printers from work, where they are reliable and quiet work horses. However, soon after I had set it up in my home network, it would not print every so often. The computer would complain it was ‘missing’, and the printer’s own maintenance web page would not respond.

This is a companion discussion topic for the original entry at