ASUS ExpertBook B1 B1400: Ethernet Not Working Fix
Intel Core i5-1235U • Realtek LAN • Windows 11
The ASUS ExpertBook B1 B1400 with Intel Core i5-1235U includes a Realtek Gigabit Ethernet port. When the wired network connection is not detected — the network icon shows no cable connected, or the adapter is missing from Device Manager — a driver or hardware issue needs to be addressed.
Check the Cable and Router Port
Test with a different Ethernet cable. Also try a different router or switch port. A faulty cable or a dead router port produces the same no connection symptoms as a driver failure. The Realtek LAN port on the ExpertBook B1 B1400 has LED indicators — if no green or yellow LED lights up when the cable is connected, the cable or router port may be at fault.
Update Realtek Ethernet Driver
Visit ASUS Support, search for ExpertBook B1 B1400, and download the Realtek LAN Driver. Install and restart. A generic or outdated Realtek driver from Windows Update can cause the adapter to be non-functional or show as unrecognized in Device Manager. The ASUS-validated driver includes firmware tuning for this specific platform.
Enable the Ethernet Adapter
Open Settings > Network and internet > Advanced network settings. Look for Ethernet (Realtek PCIe GbE Family Controller). If it shows as Disabled, click Enable. Also open Device Manager > Network adapters and verify the Realtek adapter is not disabled (shown with a down arrow). Windows can disable wired adapters via power management settings.
Reset Network Stack
Open Command Prompt as administrator. Run: netsh winsock reset then netsh int ip reset then ipconfig /flushdns. Restart. Corrupted TCP/IP or Winsock settings can prevent the Ethernet adapter from obtaining an IP address even when the driver and cable are correct, manifesting as connected but no internet or unidentified network.
Disable Ethernet Power Management
Device Manager > Network adapters > Realtek PCIe GbE > Properties > Power Management. Uncheck Allow the computer to turn off this device to save power. The Realtek Ethernet adapter on the ExpertBook B1 B1400 can stay in a low-power off state after sleep and fail to reconnect, producing persistent no Ethernet symptoms after resume.
Run Network Troubleshooter
Go to Settings > System > Troubleshoot > Other troubleshooters > Internet Connections or Network Adapter. Run the troubleshooter and apply any suggested fixes. Windows built-in network diagnostics can detect driver rollback needs, IP assignment failures, and DNS configuration issues that affect Ethernet-specific connectivity on the ExpertBook B1 B1400.
“My ExpertBook B1 B1400 Ethernet adapter disappeared from Device Manager after a Windows Update. Downloading the Realtek LAN driver from ASUS Support and reinstalling restored the Ethernet adapter immediately.”
— Mazilah Abdul Hamid, office manager
Frequently Asked Questions
Ryan holds a Computer Science degree and has spent over 15 years troubleshooting Windows hardware and driver issues across major laptop brands. He writes practical, step-by-step guides for everyday users at softwaredriverdownload.com.
Why is the Ethernet not working on the ASUS ExpertBook B1 B1400?
The most common causes are a Realtek LAN driver issue after Windows Update, the Ethernet adapter disabled in Device Manager or Network settings, or the adapter staying off after sleep due to power management settings. Update the Realtek LAN driver from ASUS Support, enable the adapter if disabled, and uncheck Allow the computer to turn off this device in the adapter power management settings.
Does the ASUS ExpertBook B1 B1400 have Ethernet?
Yes. The ASUS ExpertBook B1 B1400 includes a built-in RJ45 Gigabit Ethernet port (Realtek PCIe GbE Family Controller) for wired network connections up to 1 Gbps. The dedicated LAN port eliminates the need for a USB-C Ethernet adapter and provides more reliable latency than Wi-Fi for business applications and video conferencing.
Can I use the Ethernet and Wi-Fi simultaneously on the ASUS ExpertBook B1 B1400?
Yes. Windows 11 allows both Ethernet and Wi-Fi to be active simultaneously. When Ethernet is connected, Windows automatically routes internet traffic through the wired connection (lower metric priority to Wi-Fi). You can manually adjust adapter metric priorities in the adapter properties if you need specific routing behavior.
How do I set a static IP on the ASUS ExpertBook B1 B1400?
Go to Settings > Network and internet > Ethernet > Click the connected network > IP assignment > Edit. Select Manual, enable IPv4, and enter your static IP address, subnet mask, gateway, and DNS servers. Click Save. For business networks requiring static IP addresses, this setting persists across reboots on the ExpertBook B1 B1400.
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