Computer is Online with USB Cable but Cannot with Modem LAN Port

Today I received a call from one of my friends to discuss a strange network issue. He can access Internet on his computer using USB cable connected to his modem but it is not working when he tried to use Ethernet cable to connect his computer to the modem. His modem has router feature with 4 LAN ports and he decided to use them to connect his second computer. So he removed the USB connection and connected his computer to the LAN port with Ethernet cable. However, his computer failed to access Internet and he has no clue. This tutorial explains how to deal with such a situation and I tried my best to make it easy to understand and follow.

Online With uSB Port But Not With LAN Port

In case if you have troubles to go online when connecting your computer to the LAN port (Ethernet Port) but can go online with USB port of the modem, follow the procedure below.

  1. Check the LED on your modem And at Computer LAN Port

    If there is no light on your modem (LED near the LAN Port) or at Ethernet port on computer, it shows no active connection between your computer and modem. Possible reasons can be;

    • Loose connection- Unplug the cable from both ends and connect back
    • Modem LAN Port issue - connect cable to another LAN Port
    • Faulty Ethernet Cable - Try a different cable
    • Faulty Computer LAN card

  2. Check Computer IP Address

    If Static IP address is assigned to your computer, you must use obtain an IP address automatically option. It is because if your computer static IP address does not match the network address of the modem DHCP, your computer will not go online.
    How to Set Your Computer to Receive IP Address From Modem DHCP Server

  3. Power cycle the modem

    In this step you need to disconnect power cable from the modem and wait for 1 minute. After one minute power on the modem and wait still all the lights are steady.
    How to perform Power Cycle

  4. Uninstall LAN Card Driver and Reinstall

    Corrupted LAN card adapter prevents you from accessing Internet. You may uninstall the current adapter driver and install latest version of adapter driver.
    How to Update Adapter Driver

  5. Disable Firewall and check for the issue

    It is advised to disable the firewall protection on your computer and check for the issue.

  6. Connect your computer to another modem

    To rectify the issues with the LAN port of your computer/LAN port of your modem
    either connect a different computer or Laptop to the modem, or connect your computer to another modem.

Last step isolates the culprit port. If the issue is with modem port, you need to contact your ISP. If your computer LAN port is defective, contact your hardware vendor.

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