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Unstable Ethernet connection through wall sockets

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Nicolas -  
brupala Posted messages 111159 Registration date   Status Member Last intervention   -
Hello,

My desktop PC is connected to my router via Ethernet through wall sockets:
PC - cable - wall socket - cable running through the walls - patch panel - cable - router

When I start my PC, most of the time, it fails to connect (I have no internet access, and I cannot ping my router).
The Windows error messages are not always the same: "unidentified network," "connected, no internet access," and sometimes, there’s no error message at all, but I still can't access the internet or ping my router!
The router is working fine since I have no issues with other PCs connected via Wi-Fi.

Often, all it takes is for me to unplug the cable and plug it back in for the PC to connect successfully. Rarely, I have to do the process twice in a row.
Once the connection is restored, it is stable and I have no bandwidth issues.

Where it gets tricky is that if I connect my PC directly to the router, there are no connection issues.
But when I connect to a wall socket, the problem occurs regardless of which socket in the house I use.

Finally, I have the same behavior with two different PCs (both running Windows 10, both using the Ethernet interface of their motherboards, MSI in both cases), as well as with a MacBook Air (using the Ethernet interface of a micro-USB hub Enklen).

The problem doesn't seem to be related to the hardware, the configuration, or the cabling... If anyone has an idea, I'm all ears :)
Thanks in advance!

12 answers

  1.
    jumulka Posted messages 12090 Registration date   Status Member Last intervention   4 619
     
    Hello,
    from what you're telling me, it seems to be a problem with the wiring of the wall sockets.
    What is your patch panel made up of and how is it organized?
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  2. brupala Posted messages 111159 Registration date   Status Member Last intervention   14 453
     
    Hi,
    try different cables between the PC and wall sockets, you seem to have bad connections.
    or reverse the cables.
    try other patch cables as well, possibly.
    If it really continues, you may need to change the wall sockets which might be of poor quality.

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  3. Nicolas
     
    Hello,

    What I forgot to mention is that when I have no connection, running the Windows network diagnostic tool sometimes helps restore it. When this happens, it informs me that it has detected and fixed an IP configuration issue on the PC. So in this case, the connection is established even though I haven't touched the cables.
    Furthermore, I have already changed all the cables and checked them by directly connecting my PC to my box with each one of them and verified that the connection works without any issues...

    Thank you for your responses!
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    1. brupala Posted messages 111159 Registration date   Status Member Last intervention   14 453
       
      So,
      you'll need to plan for the replacement of the wall sockets.
      What the Windows diagnostic tool is saying is a load of nonsense, and if you don't have a good connection, you won't get an IP address automatically.
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  4. Nicolas
     
    ...even when once the connection is established, it seems to be of good quality?
    Is there a way to test the quality of a wall outlet?
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    1. brupala Posted messages 111159 Registration date   Status Member Last intervention   14 453
       
      yes,
      there are RJ45 cable testers.
      Also check visually that there is no wiring issue (twisted wires together not reaching the correct place in the socket), the cable tester won't detect a wiring issue :-(
      The PC is the same when connected directly to the box and there is no problem, plus, you yourself said that disconnecting and reconnecting is enough to restore it.
      Especially since you have the same problem with several PCs.
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  6. jumulka Posted messages 12090 Registration date   Status Member Last intervention   4 619
     
    What is your patch panel made of and how?
    Can you take some photos?
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  7. Nicolas
     
    Here are some photos of the patch bay. It consists of the same connectors as the wall sockets (without the faceplate, of course).
    However, I dismantled and inspected the sockets, and apparently, it was done poorly: shielding not connected, conductors cut!
    https://scsjdm-my.sharepoint.com/:f:/g/personal/pc103_institutionsacrecoeur_fr/EuVFGnFz42tIgql3Znhs6iwBKP1JoBugMrX0gijQrGqzXg?e=qTu1fi

    So clearly, the problem comes from there.
    For my information, how is it possible for the connection to be established even with a cut conductor?
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    1. brupala Posted messages 111159 Registration date   Status Member Last intervention   14 453
       
      If it's like in photo 1, it shouldn't work,
      unless the two ends miraculously manage to touch.
      The shielding isn't a big deal, but the white of the cut orange prevents any connection.
      The guy who pulled out the cable must have gone at it with gusto and cut half the wires in one knife stroke :-(
      When you reconnect the wires to the CAD, you need to push them forward about 2mm so that they don't cut in the same place again; well for the white/orange, obviously it's going to fall further away, the others too, I suppose, if you cut them all to the same length.
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  8. brupala Posted messages 111159 Registration date   Status Member Last intervention   14 453
     
    Resolved or not?

    --
    and ... Here we go!
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  9. Nicolas
     
    Hello,

    So yes!
    However, I confirm: with the green/white wire cut (I checked: no miraculous contact), I can get a high-speed connection (95Mbps, and it's probably limited by my internet connection and not by the PC-box link). However, with the orange/white wire cut, there's no connection.

    Thank you both!
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    1. brupala Posted messages 111159 Registration date   Status Member Last intervention   14 453
       
      Strange, or maybe the green pair is not in its place, because the green and orange pairs are used in a 10/100 connection, while the blue and brown pairs are only used in gigabit.
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  10. bzseif Posted messages 29 Status Member 1
     
    There is a problem with the RJ45 socket or the patch panel; the connection needs to be redone on both sides.
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  11. bzseif Posted messages 29 Status Member 1
     

    the color codes necessary for your connection 1,2,3,6
    you need to check it
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  12. Nicolas
     
    The wiring is correct on both sides, according to the T568B standard.
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  13. bzseif Posted messages 29 Status Member 1
     
    I think there is a problem with the wiring. If it is
    old.
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