She remembered: TFTP isn't fancy. No authentication, no directory listing. But it's lightweight and perfect for firmware pushes. Windows doesn’t enable TFTP by default, but it has a built-in client. She opened PowerShell as Administrator and ran:

Nina Sharma, a senior network technician for a regional grocery chain, is responsible for 120 IP security cameras across 15 stores. It’s 4:45 PM on a Friday. She just learned a critical firmware update must be applied to all cameras by Monday to patch a security vulnerability.

New-NetFirewallRule -DisplayName "Allow TFTP" -Direction Inbound -Protocol UDP -LocalPort 69 -Action Allow Immediately , the camera’s download began. TFTP uses a dynamic high port for the data connection, but the initial handshake is on port 69. Never forget the firewall. The Outcome By 8:30 PM, all 120 cameras were updated. Nina documented the process for her team:

copy tftp://192.168.10.100/cam_v2.1.bin flash:new_firmware.bin The camera’s request went out to UDP port 69 on her laptop. Her TFTP server saw the . Within 4 seconds, the transfer completed. The camera rebooted. Success. Step 5: The "Blocked by Firewall" Twist At Store #7, nothing worked. Her TFTP server showed zero logs. Windows Firewall was blocking UDP port 69 inbound. She quickly added a rule: