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  1. #1
    MacBook wonít connect to internet - other devices do
    Hi
    Wonder if anyone has any suggestions as Iím tearing out what little hair I have left

    I have a mid 2012 MacBook Pro running Mojave 10.14.6. There is 50gb storage remaining on a 500gb ssd and 8gb RAM

    It connects fine to my wireless network, and airport utility shows a green light for internet - but it wonít connect to the internet - I get ďcould not connect to the serverĒ or ďcould not open pageĒ no matter what site I try

    I have emptied cache and history and tried Safari and Chrome. Iíve turned off VPN, rebooted the machine and tried setting up another user - all with no effect.

    I have a MacBook Air, an iPad and an iPhone, all of which are accessing the internet via the same Wi-Fi with no problem

    Iíve checked the Network section in system preferences and can see no obvious problem in the Ďadvancedí settings and the settings mirror those on the MacBook Air that works fine (also running Mojave)

    The only thing I canít do is change the DNS - it seems to be nailed down by the router: the figure is greyed out and it wonít let me add extra by the + button. But thatís the same on the MacBook Air too (and same dns)

    I should add the MacBook Pro has worked fine on another network

    Any suggestions would be much appreciated

  2. #2

    ferrarr's Avatar
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    It does sound like something to do with your Wi-Fi network? Have you done a network power cycle? Power down everything, router, modem, and every device connected through the network like game consoles, set top boxes, printers, computers, ďhomeĒ devices, etc.


    Sent from my iPad using Mac-Forums
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  3. #3
    Thanks Ferrar - yes, I’ve done all that - and disconnected the other devices attached - no joy. I didn’t suspect the network though - the MacBook Pro’s wireless diagnostics reported all working as expected, and I’ve no problem with a MacBook Air, an IPad, an iPhone and an Apple TV box. (the only other devices on the network) which will all work together. It’s just the pro that accesses the Wi-Fi OK but can’t get on the internet, with other without the other devices connected.

    Grateful for your thoughts though

  4. #4

    MacInWin's Avatar
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    The only thing I canít do is change the DNS - it seems to be nailed down by the router: the figure is greyed out and it wonít let me add extra by the + button. But thatís the same on the MacBook Air too (and same dns)
    That is not correct behavior. The DNS should be able to be changed. What happens when you try to add extra by the + button? Is your account an admin account? You have to be an admin to change network DNS settings.

    EDIT: If you think the router is locking the DNS, turn off Wifi and then try to make a change. If you aren't connected to the router, it cannot "lock" the settings. But I'm betting it won't make a difference because something else is wrong in your network setup.
    Jake

  5. #5
    Hi MacInWin

    No, I’ve never not been able to change DNS before, it does seem like strange behaviour - but I understand this is a result of my ISP locking down the router - I can’t change router settings either: they keep the admin password secret!

    When I hit the + button a line off 0.0.0.0 appears - but as soon as I start trying to type, or if I do nothing for 10 seconds or so then it just disappears and reverts back to the original greyed out address.

    But it does that on the MacBook Air as well, and that connects fine.

    Grateful for your thoughts

  6. #6

    MacInWin's Avatar
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    There was someone else recently with that problem and I think he got sorted by running DetectX Swift to get rid of the hijacker. Let me look for that thread. BRB.
    Jake

  7. #7

    MacInWin's Avatar
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    Here is that thread, but it may not help. His just started working again.

    MacBook Pro connect to wifi but no internet

    You might try what I suggested in post #4 about stopping WiFI, make the changes, then turn WiFI back on. That way the router cannot block you because you are not connected to the router. I doubt the router could block you, anyway, as it is not authorized to make those kinds of changes, even if your ISP locks you down.

    One other thought. Turn off your firewall on the Mac. You don't need it when connected to your home network. Just remember to turn it back on when you take the Mac to an alien network.
    Jake

  8. #8

    pigoo3's Avatar
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    Quote Originally Posted by JML_UK View Post
    I have a MacBook Air, an iPad and an iPhone, all of which are accessing the internet via the same Wi-Fi with no problem...
    I would say if these other devices are connecting to your home network via WiFi ok...then it's probably a computer based issue...and not a network issue. Don't mess with your network settings (router, cable modem, etc.)...or you may mess up WiFi for your other devices.

    Two things I would try:

    1. Try connecting this computer via ethernet...to see if the computer can connect to the internet ok via ethernet. By doing this you can test if you have a computer based Network Preferences setting issue...or a hardware issue (maybe soemthing is up with the computer's WiFi hardware).

    2. Try creating a new user account & try connecting to the internet via WiFi. This new user account should have everything set at default settings...and you should have no interference from any other software installed on the computer. If you can connect to the internet via WiFi with the new account...then your main account could either have a settings issue...or a software conflict issue.

    HTH,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  9. #9
    Thank you MacInWin, much appreciated- I’ll check that thread to see if there are any useful insights there

  10. #10
    Pigoo3 - thanks for the thoughts - I’d already tried the additional user route to no effect - but the Ethernet connection suggestion is a good one - It hadn’t occurred to me because, as you say, indications are that the Wi-Fi is sound - but it’s well worth a try
    John

  11. #11

    pigoo3's Avatar
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    Quote Originally Posted by JML_UK View Post
    ... I’d already tried the additional user route to no effect...
    Sorry about that...you did mention this in post #1. Good luck with the ethernet test.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  12. #12

    ferrarr's Avatar
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    Quote Originally Posted by JML_UK View Post
    The only thing I canít do is change the DNS - it seems to be nailed down by the router: the figure is greyed out and it wonít let me add extra by the + button. But thatís the same on the MacBook Air too (and same dns)

    I should add the MacBook Pro has worked fine on another network.
    When you go into System Preferences > Network, you may need to unlock the lock to gain access to change some of the settings.


    Sent from my iPad using Mac-Forums
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  13. #13
    Hi Guys I think I may have cracked it

    Found a suggestion in a thread about not being able to change dns that a corrupt plist might be the problem

    Moved com.apple.systemprefs.plist to the desktop, rebooted - and hey presto I could then change the dns and I now have an internet connection that’s been stable for 15 mins or so

    Another one to add to the file!

    Thanks so much for your generous help

    Take care all
    John

  14. #14

    MacInWin's Avatar
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    Well done. Sorry none of us came up with that.
    Jake

  15. #15
    It’s a collective thing, MacInWin - it really helps talking through with other folk, and thinking it through. And learn something every time

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