CP1025nw not responding at IP address 192.168.1.71

[CarlSZ]

Printer is connected to two computers via Ethernet, and was working fine this morning.  (One is MacOS 10.14 Mojave; the other is MacOS 10.6 Snow Leopard.)  Now the print queue page on Snow Leopard shows "Network host 'NPIA82B28.local.' is busy; will retry..." but it never connects; the print queue page on Mojave shows "Printer is not responding".  Bonjour Scan with a network tool shows 5 active ports on the printer; I have no idea what it should show.  Attempting to check supply levels gets "Information Not Available" on both computers.  Power-cycling printer does not help, nor does restarting either computer.  Removing printer from the Print & Fax System Preferences and reinstalling it there does not help.  (Reinstallation has no trouble finding the printer on either system, and both systems show driver version 2.0.20120620.)  Attempting to connect to the printer's Web interface at IP address 192.168.1.71 with a Web browser gets the instant response "can’t establish a connection to the server at 192.168.1.71".  The printer prints a set of 3 self-test pages just fine; all four toner cartridges are at 90%, and the imaging drum was replaced 2 months ago.

My best guess is some kind of weird electronics failure within the printer; but what do I try next?

[east2100]

Power on HP CP1025 with network cable connected press the green color button (avove the pink X button) from the front panel.

It'll print 2 or three pages and the first one by the right side you'll find a IP address.

Compare with the ones in the computer to see if they're matched or not.

If it even can't print out these pages then CP1025 might have some problems.

[CarlSZ]

Test pages print OK, and IP address on the test page (192.168.1.71) matches what "Show Printer Webpage" on the Printer Settings page tries to connect to.  Test page also says Status is "Connected", Network in Use is "Wired".  But browser still cannot connect to printer.