@dimzconcept 

Hi,

Do you have access to more than one Ethernet wall socket that provides Internet connection in your building ? If yes, do you have the same problem when connected to another wall socket?

If your computer runs Windows 10, right-click on the Network icon in the taskbar and select "Open network & Internet settings". In the Window that opens click on "Ethernet" and then click on the connection that is displayed near the top of that "Ethernet" page. Scroll down a bit and verify that under IP settings it says something like "Automatic / DHCP". Also, since you are there also check the information that is shown in the "Properties" section. Do you see an IP address and one or two DNS IP addresses there?

Hi @woozle and thank you for your prompt reply,

No I only have it in my room unfortunately…

I followed your instructions: under IP settings is well mentioned "Automatic (DHCP)", but in "Properties section" I only have this:
"Manufacturer: Rivet Networks
Description: Killer E2200 Gigabit Ethernet Controller
Driver version: 9.0.0.42
Physical address (MAC): 44-8A-5B-5E-A5-78"

What should I do?
Thanks a lot,
Dimz

@dimzconcept 

It appears to me there is no Ethernet connection (or at least no properly working Ethernet connection).

Since this computer connected fine to your Archer C50 I think we can assume the computer's network card is okay.

You also said you already tried different Ethernet cables.

I think the next step would be to have someone check the Ethernet wall socket in you room. Wiring up an Ethernet wall socket can be quite tricky and certainly requires more diligence than wiring up power wall sockets or light switches. So there is a chance the wiring wasn't done right. 

@woozle Thanks for your prompt reply.

OK then, I will ask a friend to come and try with his computer to check if the problem really comes from the wall socket.
I'll give news here. :)

Thanks again, cheers!

Dimz

Hi @woozle,

So my father came with his network cable tester and it appears that the wall socket works perfectly fine. Also, he brought his laptop and plugged it, and had a good internet connection with no issue.

That means the problem really comes from my PC.

What do you think?

@dimzconcept 

Earlier you mentioned you have moved to another home. Have you visibly checked that the Ethernet port of your PC is still in good shape? Just to make sure nothing bad happened during the transport.

Other than that I don't know what could be wrong. I have never had an Ethernet port fail on me in over 25 years.

Hi @woozle, thanks again for your prompt reply.

Honestly I think it is, because I'm very precautious when it's about my computer and stuff. And also because, when I was looking for answers on forums, every guy who had the same problem as me were in the same situation: they had the same error message and before that they were on a wi-fi router.

But maybe I should buy another network card…

Thanks for the help,
Dimz