Ethernet network adapter RTL8111H network cable unplugged

Mar 24, 2018
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Hello,
So yesterday I built a new computer and when installing windows I ha no internet connection which did not bother me. When it was installed, I still had no internet connection. So I tried everything but what I could see in the windows network center:
No Connection and Unidentified Network switching permanently.
So after struggling 2 hours I installed the Realtek Ethernet Driver which I downloaded with my phone on the computer. And suddenly it worked.

I downloaded and installed Chrome, also downloaded GeForce Experience.
Restarted the PC, and regretted it.

After the restart the connection was broken again. This time a permanent red cross in the system tray on the network center with sometimes for half a second a yellow ! symbol. I tried reinstalling the driver, installing an older version, always restarting in between. Nothing works. In the Adapter Overview there is the message "Network cable unplugged" which disappears shortly when the system tray switches to the yellow !.
This night i plugged the cable from the PSU so I would have a clean reset this morning still not working.
A pc I built in December for a friend has the "asus b350 plus" mainboard which has the same Ethernet Adapter as the built one yesterday (msi z370-a pro; both have the RTL8111H). The Computer from December never had problems with Internet and still works (although obviously in a different network). It even worked without drivers.

I really have no clue what it could be now. The weirdest thing to me really is that it worked before I restarted the computer.

Thanks for any help!

Here are the components:
MSI Z370-A Pro
i5 8400 BOX
GTX 1060 Ex OC from KFA2
8GB 2400 Crucial
Windows 10 on SSD
1TB HDD

Fritzbox 7362

Pinging Fritzbox fails btw so pinging internet also fails obviously.
 
Solution
Have you tried another known working Ethernet cable?

May be that the existing cable has a bad connector on one end or another. Just broken or loose enough to sometimes connect and sometimes not connect.

And likewise check any other connections: e.g., wall jacks, power line adapters, switches, and so forth between the computer and router.

Remember to run the Windows 10 Network Troubleshooter. The troubleshooter may identify and fix some configuration or driver related error.

Ralston18

Titan
Moderator
Have you tried another known working Ethernet cable?

May be that the existing cable has a bad connector on one end or another. Just broken or loose enough to sometimes connect and sometimes not connect.

And likewise check any other connections: e.g., wall jacks, power line adapters, switches, and so forth between the computer and router.

Remember to run the Windows 10 Network Troubleshooter. The troubleshooter may identify and fix some configuration or driver related error.
 
Solution