FRITZ!Box 5490 Service - Knowledge Base

FRITZ!Box 5490 Service

LAN connection to FRITZ!Box cannot be established

One or more of the LAN ports cannot be used to establish a connection to the FRITZ!Box. After connecting a network device such as a computer, NAS system or game console to the FRITZ!Box, the FRITZ!Box does not detect it and the device cannot access the Internet or the FRITZ!Box user interface. One of the following error messages may be displayed by the network device:

  • "A network cable is unplugged."
  • "Network cable unplugged."
  • "You are currently not connected to any networks."

Simply proceed as described below. After each measure, check whether the issue persists.

1 Restarting the FRITZ!Box

  1. Unplug your FRITZ!Box by removing the power cable from the electrical outlet.
  2. Plug it in again after 5 seconds.

    Note:The FRITZ!Box settings will not be deleted when it restarts. The restart will take about 2 minutes. During this time, you cannot access the FRITZ!Box user interface.

2 Installing the latest FRITZ!OS

3 Installing the latest software for network adapters

  • Install the latest driver for your computer's LAN network adapter or the latest software for the network device.

    Note:Often the Windows Update does not offer all of the latest device drivers. Therefore, use the software from the manufacturer's website (for example Intel, Broadcom, Realtek).

4 Disabling energy-saving functions for the network adapter

  • If energy-saving functions are enabled for the computer's LAN network adapter or the network device, disable them for testing purposes.

    Note:Many LAN network adapters allow you to select various energy-saving options in the Windows Device Manager. You can find these settings on the "Power Management" tab in the properties of the network adapter.

5 Changing the FRITZ!Box's power settings

  1. Use a different network device (for example as a computer, smartphone, tablet) to open the FRITZ!Box user interface.
  2. Click "Home Network Overview" in the "Home Network" menu.
  3. Click on the "Network Settings" tab.
  4. In the "LAN Settings" section, check whether the option "Power Mode" or "Green Mode" is enabled for the LAN port used by the network device experiencing the issue.
    • If the "Green Mode" option is enabled:
      • Enable the option "Power Mode" for the LAN port you are using.
    • If the "Power Mode" option is enabled:
      • Enable the "Green Mode" option for the LAN port you are using.
  5. Click "Apply" to save your settings.

6 Testing a different LAN port

  • For testing purposes, use a network cable that is as short as possible (for example the yellow cable included with the FRITZ!Box) to connect the network device to the other LAN ports on your FRITZ!Box.
    • If your network device can access the FRITZ!Box and use its Internet connection when connected to a particular LAN port, use this LAN port instead.

7 Testing a different network device

  • Connect a different network device (such as a computer, game console) to the LAN port on the FRITZ!Box.
    • If the other network device can access the FRITZ!Box and use its Internet connection, then the issue is not caused by the FRITZ!Box.