Ethernet doesn’t have a valid IP Configuration is caused when your NIC (Network Interface Card) hooked up to your Router or Modem via the Ethernet Cable is unable to get a VALID IP Address (Internet Protocol). This is needed for the computer to speak to the router, and function on the internet. There are three main causes for this issue to occur, the first one is a faulty router, the second one is a incorrectly assigned IP Address to the computer, and the third one is the faulty NIC. We will address the issue in three steps, and they must be followed in the sequence listed.

Ethernet doesn’t have a valid IP Configuration

Restart Your System

There is a feature called Fast Startup which is designed to load settings from systems memory or cache to reduce boot and start-up time. Many users reported that this issue is fixed when the system is restarted and fast startup is disabled.

Disabling Fast Startup is undoubtedly the most effective solution capable of fixing this issue, although it results in the loss of the Fast Startup feature altogether. To disable Fast Startup, you need to:

1. Right-click on the Start Menu button to open the WinX Menu.
2. Click on Power Options in the WinX Menu.
3. Click on Choose what the power buttons do / Choose what the power button does in the left pane.
4. Click on Change settings that are currently unavailable.
5. Near the bottom of the window, uncheck the checkbox beside Turn on fast startup (recommended) to disable Fast Startup.
6. Click on Save changes.
7. Close the System Settings
8. Restart your computer.

Check Your NIC (Network Adapter Settings)

The router usually assigns the IP Address Automatically and this should be the preferred setting unless you’ve manually chosen to specify IP Address. If that is the case, then you should still set it to automatic first, once it is connected, check the Internet Properties for the correct settings and re-configure it manually.

The instruction below will work on Windows Vista/XP/7/8 and 10.

To begin, Hold the Windows Key and Press R. Type ncpa.cpl and Click OK. In the Network Connections window, right click your Network Adapter and choose Properties.

From the Ethernet Properties window, click one to highlight Internet Protocol Version 4 (TCP/IPv4) and then click on Properties. The next window will open up the Internet Protocol Version 4 (TCP/IPv4) Properties, from here make sure that the following two settings are selected.

• Obtain an IP Address Automatically
• Obtain DNS Server Address Automatically

This should do for the Ethernet Card. Move to the next stage of rebooting the router.

Reboot Your Router / Modem and Check Ethernet Cable

Power of your router, and the modem or if it is just the router then power the router off else both. Wait for 5 minutes and then turn the router back on. After it has been turned on, check your PC if it now has the valid configuration, you may need to wait a few minutes. Once this is done, test to see if it now works and has the correct configuration. If it still won’t work, then try using a different Ethernet cable from your Router to the Computer. If it still won’t work, then try connecting your computer to a different router, if it still has the same issue with the other router the network card will need to be replaced, if it does connect then the router will need to be replaced. Before you replace it, try doing a factory restore (check manufacturer’s guide for factory reset instructions for your router).

Uninstall and Reinstall your Network Adapter

1. Hold the Windows Key and Press X. Type hdwwiz.cpl and Click OK.
2. Expand, Network Adapters. Note down the name of your network card.
3. Right click on your ethernet card (nic) and choose Uninstall.
4. Click Action -> Scan for hardware changes from the top menu.

If the driver is reinstalled, it should work If not, then you will need to reinstall your network interface card using the latest driver from the manufacturer’s site, using the name you noted down do a google search to find the latest driver. To avoid similar issues with other components, it is best to use DriverAgent from here and let it update all the drivers automatically before you run into issues.

Also check out wifi doesn’t have a valid ip configuration guide.

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