Ethernet doesn't have a valid IP configuration: What It Means and How to Fix It

What Ethernet doesn't have a valid IP configuration actually means

Windows connected to the network at the physical layer (Ethernet cable and adapter are working) but the DHCP process failed — the router either did not respond to the IP lease request or returned an invalid address. The adapter falls back to an APIPA address (169.254.x.x) which cannot reach the internet.

Most likely causes (ranked)

1. Router's DHCP server is not responding (restart required)
2. DHCP lease table is exhausted — too many devices on the network
3. The Ethernet adapter driver is outdated or corrupt
4. A static IP is configured incorrectly on the adapter
5. The network adapter is in a bad state after a sleep/wake cycle

How to fix Ethernet doesn't have a valid IP configuration

Step 1: Release and renew the IP address

Open Command Prompt as administrator: run 'ipconfig /release' then 'ipconfig /renew'. If this works, your DHCP lease was stale. Monitor for recurrence.

Step 2: Restart the router

If multiple devices show this error: the router's DHCP server needs a restart. Unplug for 30 seconds, replug, wait 2 minutes.

Step 3: Check for static IP configuration

Settings → Network & Internet → Ethernet → Edit IP assignment. Ensure it is set to 'Automatic (DHCP)'. A manually entered static IP that is out of range causes this error.

Step 4: Reset the network adapter

Device Manager → Network Adapters → right-click your Ethernet adapter → Disable, wait 5 seconds, Enable. This clears the adapter state without a full reboot.

Step 5: Update the Ethernet adapter driver

Device Manager → Network Adapters → right-click Ethernet adapter → Update driver → Search automatically. Outdated drivers on Intel and Realtek adapters commonly cause DHCP failures after Windows updates.

Still not fixed? Rule out your connection

If the steps above did not clear the error, the next step is verifying the underlying internet connection is healthy. Run a speed test — if download, upload, and ping come back normal, the error is specific to one site or browser state. If the speed test also fails or shows packet loss, the problem is at the network or ISP layer.

Frequently Asked Questions

Why does this error happen after waking from sleep?

Windows sometimes fails to correctly re-initialise the Ethernet adapter after sleep, leaving it in a state where it cannot request a new DHCP lease. Disabling power management for the adapter (Device Manager → Properties → Power Management → uncheck 'Allow the computer to turn off this device to save power') prevents this.

Can the router cause this error for one device but not others?

Yes — if the DHCP lease table is nearly full and your device's lease expired, the router may not issue a new lease while other devices hold valid leases. Restart the router to clear all leases and re-issue them.