Windows 10: "Ethernet" doesn't have a valid IP configuration

Problem: intermittent no internet connectivity
Running network troubleshooter gives me the error message: "Ethernet" doesn't have a valid IP configuration

My system
Toshiba satellite laptop S75 hardwire to a personal modem arris sb6141, my ISP is Comcast xfinity. No router. I have high speed internet.

I have had the same setup for at least 2 years without this problem. All of the sudden about a month ago, I started getting no internet connection intermittently
Without any updates or changes to my system. The issue comes and goes, meaning sometimes there is no internet in the morning, I will come home from work at night and internet will be working.

I have talked to Comcast reps over the phone many times and they tell me it looks good on their end and that they can see my modem, they did a reset of my modem but it didn't help.
Comcast has sent 3 different techs at my place and they both said the wiring has no issue. I had the third comcast tech remove a splitter outside my apartment, but it made no difference for my connection.
I have replaced the Ethernet cable, but there is no improvement.
When it first started I had windows 10 pro original version on my laptop, I updated windows 10 to build 1803 but it didn't help.
Then I updated windows 10 to build 1809 and internet started working again for a week with no issue at all.
Then the intermittent no connectivity issue came back.
The lights on the modem look good. There is no yellow exclamation point in the device manager. The IP configuration is set to obtain an address automatically. I have done a network reset. I need your help, please.
I can get wi-fi to work on same laptop (open xfinity wi-fi from neighbor).
I installed the latest drivers, the network driver version is now 10.31.828.2018 and I did a network reset, but it didn't help.

:)

 

ethernet does not have a valid ip configuration

Hi Chrisoffer,

You may try the suggestions posted by Vijay B on December 10, 2013
on a similar issue.

Ethernet doesn't have a valid ip configuration

(Steps hold good for Windows 10)

Do let us know if you are able to connect to internet through Ethernet. Thank you.

 

Repeated "wifi doesn't have a valid ip configuration" error message daily

Ethernet doesn’t have a valid IP Configuration is often appear on Windows 10/8.1/7 based operating system. The average Windows user encountered the problem when wanting to connect to a Wi-Fi or Local Area Network (LAN) via Ethernet. Here
is an example of an error message that often appears when connecting to the network:

• Ethernet doesn’t have a valid IP configuration.
• Local area connection doesn’t have a valid IP configuration.
• Wi-Fi doesn’t have a valid IP configuration.
• Wireless network connection doesn’t have a valid IP configuration.

try steps here: Fix Ethernet doesn't have a valid IP Configuration | Get Help in Windows 10

 

"'Ethernet 3' doesn't have a valid IP configuration

Hello,

Thank you for showing interest in Windows 10.

You may try the suggestions posted by Vijay B on December 10, 2013 on a similar issue.

Ethernet doesn't have a valid ip configuration

(Steps hold good for Windows 10)

Let us know the results once you have tried these methods. Hope this information was helpful.