1. Introduction
This manual provides detailed instructions for the setup, operation, maintenance, and troubleshooting of your HUNSN RJ43 Micro Firewall Appliance. This device is a compact, fanless mini PC designed for network security applications, including use as a firewall, VPN server, or router. It features an Intel Alder Lake-N 12th Gen N100 processor and multiple 2.5GbE network ports, making it suitable for various network environments.
2. Product Overview
The HUNSN RJ43 is built with a durable aluminum chassis, providing efficient heat dissipation through its fanless design. It offers a comprehensive set of I/O interfaces for versatile connectivity.
2.1 Front Panel Layout

Figure 1: Front Panel of HUNSN RJ43
The front panel includes essential ports and indicators for easy access:
- Power Button: Used to turn the device on or off.
- USB Ports: Two USB 3.0 ports for connecting peripherals.
- DisplayPort (DP1.4): For video output to a monitor.
- TF Slot: For data storage or system boot from a TF card.
- Type-C Port: Supports both display output and data transfer.
2.2 Rear Panel Layout

Figure 2: Rear Panel of HUNSN RJ43
The rear panel provides connectivity for network and power:
- Ethernet Ports (ETH0-ETH3): Four Intel 2.5GbE I226-V ports for high-speed network connections.
- USB Ports: Four USB 2.0 ports for additional peripheral connections.
- HDMI Ports (HDMI2.1): Two ports for video output to displays.
- DC_IN: Power input connector (12V3A).
3. Setup
3.1 Unpacking and Inspection
Carefully unpack the HUNSN RJ43 appliance and verify that all components are present:
- HUNSN RJ43 firewall appliance
- Power supply (12V3A)
- Power cord
- Warranty card
Inspect the device for any physical damage. If any components are missing or damaged, contact customer support immediately.
3.2 Hardware Connections
- Connect Power: Plug the power supply into the DC_IN port on the rear panel and then connect the power cord to an electrical outlet.
- Connect Network Cables: Connect your network cables to the 2.5GbE Ethernet ports (ETH0-ETH3) as required by your network configuration.
- Connect Display (Optional): If you need to access the BIOS or install an operating system, connect a monitor to one of the HDMI or DisplayPort outputs.
- Connect Peripherals (Optional): Connect a keyboard and mouse to the USB ports if needed for initial setup.
3.3 Initial Boot
Press the power button on the front panel to turn on the device. The system will begin the boot process. The device supports hardware auto power on by default.
4. Operating System Installation and Configuration
The HUNSN RJ43 supports various operating systems and open-source firewall solutions. It is compatible with 5.10.x and above core-based FreeBSD router systems, Linux distributions, and Windows operating systems. Please note that the device supports UEFI boot only.
- Supported Systems: pfSense Plus, OPNsense, various Linux distros, Windows OS.
- Installation Medium: Use a USB drive or TF card with your chosen operating system's installation image.
- BIOS Access: During boot, press the designated key (usually DEL or F2) to enter the BIOS/UEFI settings if you need to adjust boot order or other parameters.
- Network Configuration: After OS installation, configure the network interfaces (LAN/WAN) according to your specific firewall or router requirements.
5. Maintenance
The HUNSN RJ43 features a fanless design, which significantly reduces maintenance requirements and noise (0.00db). This design also contributes to its durability and reliability in various environments.
- Cleaning: Periodically clean the exterior of the device with a soft, dry cloth to remove dust. Ensure the heat sink fins (top of the device) are free from obstructions to maintain optimal passive cooling.
- Storage/RAM Upgrades: The device supports memory upgrades up to 32GB DDR5 via one SO-DIMM slot. Storage can be expanded with two M.2 2280 NVME x1 SSDs and one 2.5-inch SATA SSD/HDD. Refer to the detailed specifications for compatible components.
- Firmware Updates: Regularly check the HUNSN official website or your chosen operating system's documentation for firmware and software updates to ensure optimal performance and security.
6. Troubleshooting
This section provides solutions to common issues you might encounter with your HUNSN RJ43 appliance.
6.1 No Power
- Ensure the power adapter is securely connected to the device and a working electrical outlet.
- Verify the power outlet is functional by plugging in another device.
- Check the power supply unit for any visible damage.
6.2 No Display Output
- Confirm the monitor is powered on and set to the correct input source (HDMI/DisplayPort).
- Try connecting to a different HDMI or DisplayPort on the device.
- Ensure the display cable is securely connected at both ends.
- If using a Type-C display, ensure your monitor or adapter supports display output via Type-C.
6.3 Network Connectivity Issues
- Check that Ethernet cables are properly connected to the RJ43 and your network devices (router, switch).
- Verify the network status lights on the Ethernet ports.
- Ensure your operating system's network drivers are correctly installed and configured.
- Check your firewall or router software configuration for any rules blocking traffic.
7. Specifications
Detailed technical specifications for the HUNSN RJ43 Micro Firewall Appliance:
| Feature | Description |
|---|---|
| Model Number | HUNSN RJ43 |
| Chassis | Aluminum with knockout hole |
| CPU | Intel Processor N100 (6M Cache, up to 3.40 GHz) |
| AES-NI Supported | Yes |
| Memory | 1 x SO DIMM DDR5 4800 MT/s, up to 32GB |
| Storage | 2 x M.2 2280 NVME x1 SSD, 1 x 2.5 Inch SATA SSD/HDD (with DIY knockout holes) |
| Network Card | Intel 2.5GbE I226-V (4 ports) |
| I/O Interface | Power ON/OFF, 5 x USB2.0, 1 x USB3.0, DP1.4, TF slot, Type-C (display/data), 4 x LAN, 2 x HDMI2.1, DC_IN |
| Expansion | Built-in reserved TPM header |
| Power | DC100-240V AC/50-60hz, 12V3A |
| Operating Temperature | -10°c ~ 70°c |
| Storage Temperature | 0°c ~ 70°c |
| Relative Humidity | 5% ~ 85% non-condensing |
| TDP | 6W |
| Cooling System | Fanless (80x80mm holes, supports optional 8010 fan, 1x small 4pin fan socket for 5V PMW temperature-control) |
| Size | 145.6 x 158 x 60.2mm |
| Weight | 1.3 kgs |
| Functions | Hardware auto power on (default), network wake-up, system power management, temperature management |
| System Compatibility | 5.10.x+ core-based FreeBSD router systems, Linux distros, Windows OS (UEFI support only) |
| Firewall Compatibility | pfSense Plus, OPNsense, and other popular open-source solutions |
8. Warranty Information
Your HUNSN RJ43 Micro Firewall Appliance comes with a warranty. Please refer to the warranty card included in the packaging for specific terms, conditions, and duration of the warranty coverage. Retain your proof of purchase for any warranty claims.
9. Support
For technical assistance, customization needs, or any other inquiries regarding your HUNSN RJ43 appliance, please contact HUNSN customer support. You can visit the official HUNSN store on Amazon or use the contact information provided with your product for a timely reply.




