Occasional disconnecting Ethernet connection

Discussion in 'MacBook Pro' started by slo-climber, Apr 25, 2014.

  1. slo-climber macrumors member

    Joined:
    Oct 28, 2013
    #1
    My rMBP is connected both - wirelessly and by cable. Reason for this is, because the wifi signal is very weak where I'm using my laptop.

    But occasionally, wired connection becomes disconnected. When this happens, the lights on the back side where the cable is connected, are not illuminated. But WiFi connection is still working.

    Is this problem on my router, my Mac or anywhere else? Thanks
     
  2. Barney63 macrumors 6502a

    Barney63

    Joined:
    Jan 9, 2014
    Location:
    Bolton, UK.
    #2
    Is your cable OK?
    Sometimes the cable fractures at the RJ45 joint.
    A damaged cable would exhibit that sort of fault.

    Barney
     
  3. drenline macrumors 6502a

    drenline

    Joined:
    Aug 8, 2010
    #3
    your ethernet cable should not be disconnecting...

    it's either your modem or ethernet cable.
     
  4. simonsi macrumors 601

    simonsi

    Joined:
    Jan 3, 2014
    Location:
    Auckland
    #4
    101
    1. Try a different port on the router, if still fails
    2. Try a different cable, if still fails
    3. Try a different router, if still fails
    4. Its your Mac port
     
  5. slo-climber thread starter macrumors member

    Joined:
    Oct 28, 2013
    #5
    Now, it shows me this in Network preferences (see image below). What does that mean?

    [​IMG]
     
  6. simonsi macrumors 601

    simonsi

    Joined:
    Jan 3, 2014
    Location:
    Auckland
    #6
    It means your mac isnt being given an ip address by the network.

    Carry out the simple process above and you will fix the issue.
     
  7. slo-climber thread starter macrumors member

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    Oct 28, 2013
  8. simonsi macrumors 601

    simonsi

    Joined:
    Jan 3, 2014
    Location:
    Auckland
    #8
    Your mac gives itself one, which isnt much use as it wont let you connect to the network.

    You have an ethernet connection issue, until you fix it, it will give symptom like this.
     
  9. blueroom macrumors 603

    blueroom

    Joined:
    Feb 15, 2009
    Location:
    Toronto, Canada
    #9
    What is the router make / model? Perhaps it's dying / overheating.
    Are you using Apple's Ethernet adapter or a third party one?
     
  10. slo-climber thread starter macrumors member

    Joined:
    Oct 28, 2013
    #10
    Actually, I noticed something else now. When I have cable unplugged and only connected with Wi-Fi, internet works quite fast (also here where signal is weaker). Then, if I plug in the cable, it connects, but internet become much more slower. Then, if I unplug it again and being connected only with Wi-Fi, it works faster again. Does that make any sense?

    Yes, I have original Apple's adapter.
     
  11. simonsi macrumors 601

    simonsi

    Joined:
    Jan 3, 2014
    Location:
    Auckland
    #11
    Not normally but you have an ethernet issue so yes it makes sense. Have you tried another port or cable yet? It would have taken less time than posting your latest symptom.

    Until you do there really isn't any point in continuing to post your "strange symptom of the day", unless you are trolling.
     
  12. slo-climber thread starter macrumors member

    Joined:
    Oct 28, 2013
    #12
    I tried to change port, but it was the same. Did not try to change cable, yet.

    Thanks
     
  13. slo-climber thread starter macrumors member

    Joined:
    Oct 28, 2013
    #13
    Now I figured out that, if I have connected computer wirelessly near router or with very short cable (1.5 m), internet works very fast. But if I have connected with another cable which is long 15 m it works very bad. This cable I have installed from router to my room.

    In both cases above I plug cable into the same port.

    How weaker should be the signal at the end of 15 m long cable compared to 1.5 m? Because the difference in my case is enormous. Do you think is there a problem with the cable itself?

    Thanks
     
  14. simonsi macrumors 601

    simonsi

    Joined:
    Jan 3, 2014
    Location:
    Auckland
    #14
    No loss at the end of a cable of that length (assuming a good cable).

    Try connecting with the cable then turning the WiFi OFF on your mac, that will force it to use the ethernet cable connection and you should see the same speed. I suspect you are still using WiFi as the active connection even though you have the cable connected, and 15m on WiFi will see a degradation, especially with walls and potentially other stuff in the way in a typical house.
     
  15. slo-climber thread starter macrumors member

    Joined:
    Oct 28, 2013
    #15
    I tried both - with WiFi turned on and off. But it is slow in both cases. If I connect
    with another cable (shorter) near router, it works as it has to.

    Probably the cable should be bad or damaged.
     
  16. simonsi macrumors 601

    simonsi

    Joined:
    Jan 3, 2014
    Location:
    Auckland
    #16
    I think so based on what you have said.
     

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