I recently bought an ethernet to USB adapter as it is now a job requirement for me to have an ethernet connection and my laptop doesn't have one natively. I cannot for the life of me figure out the problem. Maybe it's something to do with the router?

The problem as described by the network troubleshooter: "Ethernet 4" doesn't have a valid IP configuration

It is getting a local IP as can be seen here:

 Ethernet adapter Ethernet 4:

   Connection-specific DNS Suffix  . :  
   Description . . . . . . . . . . . : Realtek USB GbE Family Controller #2  
   Physical Address. . . . . . . . . : 00-E0-4C-68-D6-35  
   DHCP Enabled. . . . . . . . . . . : No  
   Autoconfiguration Enabled . . . . : Yes  
   Link-local IPv6 Address . . . . . : fe80::48f1:6bbb:c6c2:ff40%18(Preferred)  
   Autoconfiguration IPv4 Address. . :  
   Subnet Mask . . . . . . . . . . . :  
   Default Gateway . . . . . . . . . :  
   DHCPv6 IAID . . . . . . . . . . . : 335601740  
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-21-43-E0-A4-9C-B6-D0-D4-5E-51  
   DNS Servers . . . . . . . . . . . :  
   NetBIOS over Tcpip. . . . . . . . : Enabled  

So if I am understanding correctly this -due to the IP address and no gateway address- is a communication problem between my router and computer, right?

Things I tried:

1) Admin command promt: netsh winsock reset netsh int ip reset


2) Disable and enable NIC in Network Connections reboot

3) Ensured that IP Address and DNS Address are set to automatic

4) Uninstalled device from Device Manager Updated drivers from Device Manager

5) Manually set IP Adress settings to: IP Address:
Subnet Mask: Default Gateway:

Preferred DNS server: Alternate DNS Server:

6) Admin command prompt: ipconfig/flushdns nbtstat -R nbtstat -RR netsh int ip reset c:\resetlog.txt netsh winsock reset

7) Turned off computer Turned off router for 30 seconds Restarted router Turned on computer

Is there anything that might indicate the problem is some configuration or something like this with my computer? I do have direct access to the router but I am not the owner and doubt I would be allowed to update the firmware or something like that. Thanks all for your help, any guidance is greatly appreciated.

  • 2
    Your descriptions mentions #2, do you have two adapters or maybe have used different usb ports? Also there is no gateway defined. Your IPv4 address is of apipa type. Did you issue an ipconfiog /All to see all adpters? Maybe your Wlan configuration interferes? – LotPings May 29 '18 at 21:53
  • 1
    In the future I'd look into buying an AX88179-based adapter instead... – user1686 May 30 '18 at 4:39
  • I do not have two adapters and have only used the adapter on one port. Why it says #2 I have no clue. I did use ipconfig /all to see all adapters, I am confident this is the correct one, especially since it's my only LAN option under Network Connections. @grawity How is an adapter with that chip better? Thanks – ricky May 30 '18 at 21:48

You can try these seven steps:

1: Disable Fast Startup and Reboot

2: Disable and Enable NIC

3: Release and renew IP address

4: Reset TCP/IP settings

5: Check Network Adapter Settings

6: Uninstall and Reinstall Ethernet Driver

7: Restart the Router/Modem and Check Ethernet Cables

And this is the tutorial with pictures: https://windows10skill.com/ethernet-doesnt-have-a-valid-ip-configuration-windows-10/

| improve this answer | |

Just within the last week I have had four computers exhibit similar issues. It has to have something to do with a Windows update. The fix for me has been to go in to device manager and remove it (but don't uninstall the driver) then reboot.

| improve this answer | |
  • KB4103718 any more questions? – Refurb May 29 '18 at 23:49
  • My answer is fine the way it is. Thanks.Is there something in it you don't understand? He is using DHCP anyway. Uninstalling the NIC and rebooting might take all of 30 seconds. – Refurb May 30 '18 at 0:19
  • If you don't know how to un-install a component in device manager without un-installing the driver then rebooting maybe you should post a question to that effect. Based on the way this gentleman asked the question it would appear he knows how to do it. – Refurb May 30 '18 at 0:24
  • Not interested. Why you are beating this to death is beyond me. My first suggestion was to uninstall the NIC and reboot. My supposition was that it was a Windows Update. Kind of like your answer " means DHCP isn’t working". Too nebulous. There could be no DHCP server on the line, the DHCP server could not new working, the NIC could be in a state DHCP won't bind. Maybe you could improve you answer? – Refurb May 30 '18 at 0:34
  • Your absolutely right. I shouldn’t have made my original comment. I apologize. In the interest of clearing the comment section I removed my comments. – Ramhound May 30 '18 at 0:37

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.