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Troubleshooting Ethernet networking issues - ThinkPad

Some of these steps may not apply to your computer. Test for network connectivity after performing each step.

  1. Verify that the link light illuminates when the cable is connected.
    1. Where the network cable plugs into the network card, there are usually 1 or 2 LED indicators. One should be green (either solid or blinking).

      ThinkPad system Ethernet port ThinkPad slim system Ethernet port

      Note: If the link light is not on, then there may be a problem with either the network cable or the network itself.
    2. If possible, also check the other end of the cable. If plugged directly into a hub or switch, you should also see an LED indicator that there is a connection.
    3. If one or both ends does not have this indicator, try a different network cable.

  2. Verify that the most recent driver for the adapter is installed.
    Check the Software and Device Driver page for the latest driver and/or firmware update for optional cards. Note: If you are using a card from a different manufacturer, please check the card's documentation for the proper web site to visit.
  3. Run system diagnostics for your Thinkpad.
    Test the system's ethernet adapter if available. The diagnostics are available under the downloads for the system here.
  4. Verify that the network adapter is properly seated.
    Note:
    Most ThinkPad systems have integrated Ethernet cards that cannot be removed. Consult your Service and Troubleshooting Guide or Access ThinkPad / Access Help application for removal and installation instructions where available.
  5. Verify that the network adapter is being seen by the operating system.
    To check Device Manager and look for an icon that appears as Network Adapters and see if the network card is installed:
    a. Right-click the My Computer / Computer icon and select Manage.
    b. Click Device Manager in the left pane. Expand the network adapters section and see if your Ethernet device is listed
    Note: An exclamation mark over a yellow background is an indication that the card is experiencing a problem. Proceed to step 10

  6. Verify that TCP/IP (or other appropriate protocol) is properly installed.
    To check this:
    1. Right-click the My Network Places icon and select Properties. The network card should be present as Local Area Connection.
    2. Right-click the appropriate Local Area Connection and select Properties. In the Properties window, make sure that the Internet Protocol (TCP/IP) is installed.
    3. If TCP/IP is not installed, click Install, click Protocol, and then click TCP/IP.
    4. Once installed make sure that Obtain an IP address automatically, and Obtain DNS server address automatically are checked (if using DHCP). To verify this, highlight the TCP/IP protocol, and select Properties.
      Note: Only use a Static IP Address if your network/Service Provider requires one.

  7. Verify the TCP/IP address.
    1. Click Start, select Programs, select Accessories, and then click Command Prompt.
    2. Type the command, ipconfig. This will list the IP address for the local machine.
    3. If this returns a 169.x.x.x or 0.0.0.0 address, then type the following commands, ipconfig /release and then ipconfig /renew. You should then receive a TCP/IP address appropriate to your network, along with a Default Gateway address.
    4. Try to communicate with it by typing this command ping x.x.x.x where x.x.x.x is the IP address of the Default Gateway.
    5. If this does not give a reply or you did not receive a TCP/IP address, go to the next step.

  8. Ping the loopback address.
    1. Click Start, select Programs, select Accessories, and then click Command Prompt.
    2. Type the command, ping 127.0.0.1. This will send a message to the internal network stack on the machine. You should see a response like this:

      Pinging 127.0.0.1 with 32 bytes of data:

      Reply from 127.0.0.1: bytes=32 time<10ms TTL=128
      Reply from 127.0.0.1: bytes=32 time<10ms TTL=128
      Reply from 127.0.0.1: bytes=32 time<10ms TTL=128
      Reply from 127.0.0.1: bytes=32 time<10ms TTL=128

      Ping statistics for 127.0.0.1:
      Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
      Approximate round trip times in milliseconds:
      Minimum = 0ms, Maximum = 0ms, Average = 0ms

  9. Install latest Service Packs for Operating System or Network Client.
    It may be necessary to install Service Packs for either the operating system or for any additional network clients that may be installed. Contact the software vendor for these updates which are usually free downloads.
  10. If these steps have not solved your problem:
    Refer to "Need more help?"
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  • Alias ID: MIGR-4YQP53
  • Document ID: HT080144
  • Last Updated :17/06/2014
  • (c) 2014 Lenovo