'Ethernet' doesn't have a valid IP configuration

[elias.ioppolo]

Greetings.

I humbly registered to your forums seeking for help.

I am opening this thread regarding my ethernet connection: for years, I have been connecting my computer to my router via this device. The guy who sold me this, of course, told me back when I was 18 (I am now 24) that it could entirely replace an ethernet cable's performance with the benefit of space. Only 3 days ago, since I was experiencing frustrating problems related to my net, I decided to try and use a pure ethernet cable under a friend's suggestion.

I noticed, although, that my first attempt to connect the etherne cable, I couldn't really extablish an internet connection as my network icon was like this. That's why I went back to my router and tried to change the ethernet input from n°1 to n°4, and when I reached for my PC it actually fixed it. So I immediately ran a speed test to see if anything in my net performance actually improved.

As you can see from the attachment, the results were amazing:

wherein before I had:
PING: 34 DOWNLOAD: 5.27Mbps UPLOAD: 5.13Mbps

But since the cable was cutting through my room in a very unpractical and unaesthetic way, I had to unplug the cable to reposition it around my furniture and adapt it to my room. When I checked my pc, though, the same problem as before occurred. So I went back to my router and tried to change the ethernet input back to n°1, unsuccessfully. I tried any input, but nothing made a difference. I ran the troubleshooter to see if I could at least identify the problem, and the error message I received is as the title dictates:

'Ethernet' doesn't have a valid IP configuration.

I phoned an IT friend of mine to see if he could help me and he suggested me to change the ethernet cable, so I went and bought ab rand new one to replace it and see if the problem disappeared but it didn't. So I tried EACH AND EVERY possible fix I've found around the internet related to my problem, but without success.

Here's a list of the solutions I've tried without success:

• 
  ■ network adapter complete uninstall, reinstall and manually update drivers previously downloaded from manufacturer's website ( Realtek PCIe FE family controller )
  ■ change IP and DNS from static to automatic (which I actually already setted up into automatic) in the Internet Protocol Version 4 (TCP/IPv4) Properties tab
  ■ change IP and DNS from automatic to static in the Internet Protocol Version 4 (TCP/IPv4) Properties tab
  ■ tried the following cmd commands: netsh winsock reset > netsh int ip reset > *restart pc
  ■ tried the following cmd commands: ipconfig /release (from which I'd receive an error) > ipconfig /flushdns > ipconfig /renew > *restart pc
  ■ start the PC in safe mode and try to connect to the internet: still couldn't ( which made clear to me it wasn't a driver issue anyway)
  ■ turn off fast startup from power settings
  ■ enable and disable my network adapter
  ■ disable firewall/antivirus
  ■ repeatedly launching the network troubleshooter to see if the message error changed or could eventually get fixed by itself

Until I tried to install ' Reliable Multicast Protocol ' by following these steps:

The yellow warning message disappeared and I could surf the internet at its maximum performance.
I didn't have any problem until I turned off my PC and turned it back on the following day.

The same error message would pop out after running the network troubleshooter.
So after trying to uninstall and install back the protocol, as I thought it could be related since it fixed the problem for me the previous day, I tried other solutions.

What seemed to work, was going to: Control Panel > Network and Internet > Network Connections > Ethernet > Properties > Configure > Power Management > *uncheck the box near the 'Allow the computer to turn off this device to save power' option.

Just like before, I went through the all day without a single problem.
Until the following day, which is today, I had exactly the same yellow warning triangle with the same error message: ' Ethernet ' doesn't have a valid IP configuration.
That's why I desperately once more went to the same option tab that seemed to fix my problem the day before and checking back the box, then restarting the PC then unchecking it once more. And after all of this, I tried to run the troubleshooter and, surprise, this time it fixed it by itself.

For now, I am able to use my connection through my internet cable without a problem and at the fullest, but to prevent this from happening tomorrow when I come back from work (which is going to frustrate me a lot), I am asking for help.

I sincerely thank you all in advance and I hope you have a great day!

 

[RealBeast]

First, I'm not sure what you mean with "ethernet input from n°1 to n°4", I will assume that those are LAN ports and your router is connected to a modem using the WAN port or that you have a DSL line to the modem/router combo unit. If that is correct, trying a different LAN port is useful as one could be faulty.

I would try resetting the pair of Powerline adapters as they can sometimes set up their own network that is not in the range of yours which blocks access. Also, reset your router to its baseline settings using its reset button since those were changed multiple times.

It seems on your PL adapter set their is a feature to set up a private network (page 15, although I don't read Italian there is enough in English to make it a concern), insure that is disabled -- you want the public network setting unless you go through and configure it correctly and need the private network feature.

Could you also post a screen shot of your command prompt results from running the ipconfig command when it is not connecting.

And no, you do not want your computer power save to shut off your connection, but I doubt that is the source of the issue and you made multiple other network setting changes simultaneously.

One last, probably unrelated issue. Those are very old adapters and the newer AV2-1200 like TP-Link TL-PL8030 or similar are much faster than your Internet connection and won't be slower than your ISP speed as the old pair may be, the newer models are also much better at dealing with interference on your power lines.

 

[elias.ioppolo]

I am sorry, perhaps I haven't been too specific in my post; I am currently not using the powerlines anymore.
Those don't give me any kind of problem at all, instead what seems to be faulty is the ethernet cable.

And yes, for ethernet input n° I mean the ports on the back of my router

I replaced the powerlines with a classic ethernet cable and I realized that the network performance drastically improved so now I am trying to keep the latter, except that every day another problem seems to pop out and it's different everytime.

 

[RealBeast]

AH, sorry at first read I was less than comprehensive as that was the 10th or so thread that I covered.

Sounds like a much better plan using cable, as those really are quite slow adapters.

Insure that the cable doesn't run along electric power cables as that can cause significant interference depending on what they are powering, also no tight bends or points where they get pinched substantially. That said, I doubt the cable is the issue.

I've had to use a number of addon Intel PCIe LAN boards but the onboard controller is always completely dead, not just intermittent.

One thing that I do for an unknown network issue (although not intermittent) is to change your Ethernet adapter MAC address with THIS free tool. It doesn't actually change the hardware MAC address as that is not possible, but it does change the one that Windows uses and about half the time it can cure odd problems quickly.

And definitely, do reset your modem as part of the troubleshooting process as there can be lingering issues when you make any significant change in the wiring and devices (like excluding the PL adapters).

 

[elias.ioppolo]

I thank you so much for your response.

About the software you suggested me, how does it work exactly?
If the problem persist tomorrow, how should I make use of it?

I am going to turn off the PC for today and hope tomorrow it's not going to give me troubles again.
If anything, I already downloaded the Technitium MAC Address Changer and placed the zip file in the desktop ready for use just in case.

If tomorrow I'm going to need it, I'll check this post through my smartphone.

If I manage to find a stable solution to my problem anyway, I'll make sure to post it.

Cheers.

---------------------------------------------------------------------------------------------------------------------------------
UPDATE
The following day I didn't have any problem.
After a short delay after turning on my PC, the internet connection established without problem.
I'll wait some more before making sure to mark a solution for this problem.

 

[davidwarners007]

Method 1: Update or Reinstall Network Adapter Drivers

• Open Device Manager Windows 10. You can press the Windows + R key on the keyboard at the same time to open Windows Run. Then type hdwwiz.cpl and press enter.
• Click on the network adapter in the Device Manager window to expand it. Then, you can right-click on your network card and click Update Driver.
• Choose Automatically search for updated driver software to update the network driver for the latest version.

Easy And Best Method if You Need More Method for How do I fix Ethernet doesn't have a valid IP configuration? check This link