He pressed the touchscreen. It was unresponsive for a beat, then flickered to life, showing the home menu. He navigated: > Network > Ethernet > IPv4 Configuration . The screen displayed the culprit: Manual IP: 192.168.1.120 . Beside it, the subnet mask and default gateway stared back, patient and correct.

Leo knew exactly what had happened. The firm’s DHCP server, which hands out temporary IP addresses like a busy maître d', had given the printer’s old address—192.168.1.120—to a new employee’s laptop. The printer, stubbornly configured with a static IP from a forgotten setup years ago, was now a silent squatter on an address it no longer owned.

"Leo? The printer's working again! What did you do?"

The problem was a ghost. For three days, the third-floor marketing department had been unable to print to "Finance-HP-LaserJet-03." The print queue would show "Printing..." for a moment, then error out: "Printer not found." A classic IP address conflict.