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Guide: Ethernet doesn’t have a valid IP configuration – How to Fix It


You might encounter this issue if the Ethernet Cable cannot get a valid IP Address. There are three causes for this issue: one could be a faulty router, the second one could be a faulty IP Address assigned to your computer or the third one could be a faulty Network Interface Card (NIC).

To solve this problem, we will provide three steps for you, which you must follow in this exact sequence.

Restart the System

There is a feature, called ‘Fast Startup’, that might cause this problem. A lot of users found out that by disabling this feature, their issue was fixed. By disabling the ‘Fast Startup’, you will no longer have it (until you enable it again), but you might fix the issue.

  1. Go to ‘Start Menu’ -> open ‘WinX Menu’
  2. Go to ‘Power Options’ -> click on ‘Choose what the power buttons do’ / ‘Choose what the power button does’ (the left pane)
  3. Click: ‘Change settings that are currently unavailable’
  4. Go to the bottom of the window and uncheck beside where it says: ‘Turn on fast startup (recommended)’ – this will disable the ‘Fast Startup’ feature.
  5. Click ‘Save changes’ and close ‘System Settings’. Restart your computer.
  6. Check Your Network Interface Card

If you have a router, then you should know that it automatically assigns an IP address, and it’s preferred to let it do that. But if it’s set to manually choose to specify an IP Address, you should switch to the automatic mode. When it connects, go to ‘Internet Properties’ and see if the settings are correct. If not, configure them manually.

Follow the next steps:

  1. Hold ‘Windows’ Key and press ‘R’ -> type ‘ncpa.cpl’ -> OK.
  2. You will see the Network Connections window -> right click on ‘Network Adapter’ -> ‘Properties’
  3. Click on ‘Internet Protocol Version 4 (TCP/IPv4)’ and go to ‘Properties’.
  4. In the ‘Properties’ check ‘Obtain an IP address automatically’ and check ‘Obtain DNS server address automatically’. Click on ‘OK’.

After this process, move to the next step.

Rebooting the Router/ Modem & Checking Ethernet Cable

Power off the router and the modem. If you only have the router, then power it off. Let them/it rest for five minutes and reboot them/it.

After being turned on, go and check your PC and see if there is a valid configuration. You should wait for a few minutes until it gets it. When it gets it, check if it works and if the configuration is correct.

If the issue persists, try and change the Ethernet cable with another one to connect the router with your PC. If you still have this problem, try another router and connect it to your computer. If this still won’t solve the issue, then there is a problem with the network card, and you should replace it.

If your router is the cause of the issue, then you should try doing a factory reset before buying a new one and see if it got fixed in the process.

  1. Uninstall & Reinstall the Network Adapter
  2. Hold ‘Windows’ key and press ‘X’ -> type ‘hdwwiz.cpl’ -> OK.
  3. Go to ‘Network Adapters’ and expand it. Write down the name of the network card.
  4. Right click on Network Interface Card and click on ‘Uninstall’.
  5. Click ‘Action’ -> ‘Scan for hardware changes’

Your driver will reinstall, and the problem should be fixed. If not, then you should reinstall the network interface card by searching on an internet browser the name of your network card that you have previously written down and get the latest driver.

To avoid issues with drivers, we recommend installing DriverAgent and let it automatically update all your drivers.