Obsidian_Jiang

Q: [problem with Sierra] cannot connect to the internet after sleeping

After upgrading to macOS Sierra, my iMac cannot connect to the internet after sleeping. It works after restarting. There is no problem with the internet connection of other devices using the same router. I'm wondering how can I fix it (I don't wanna restarting it all the time). Thanks!

iMac, Other OS, macOS Sierra

Posted on Oct 2, 2016 9:46 PM

Close

Q: [problem with Sierra] cannot connect to the internet after sleeping

  • All replies
  • Helpful answers

  • by K Shaffer,

    K Shaffer K Shaffer Oct 2, 2016 11:10 PM in response to Obsidian_Jiang
    Level 6 (14,441 points)
    Desktops
    Oct 2, 2016 11:10 PM in response to Obsidian_Jiang

    You could set up a second user account to use as troubleshooting, & see

    what may be different about your admin or main user account; especially

    if the second user account has no similar issue or problem with wi-fi.

     

    There is a macOS utility to help diagnose wireless internet connections in Sierra.

     

    •How to use Wireless Diagnostics to help you resolve Mac Wi-Fi issues ...

    www.appleworld.today/.../how-to-use-wireless-diagnostics-to-help-you-r...

    Feb 2, 2016 - How to use Optimized Storage in macOS Sierra

     

    •Check for Wi-Fi issues using your Mac - Apple Support

    support.apple.com/en-us/HT202663

     

    Not sure if the Console utility log files could be helpful to diagnose this

    issue of disconnect during sleep. The system constantly generates logs

    and so there are countless thousands in the course of a year. The Day

    and Time (plus seconds) are an essential part of the log. That much is

    the easy part; the rest amounts to another language most don't know.

     

    You can select from the antenna icon in the upper right Finder window

    to see the network preference settings, and also can have macOS X

    remember the visited wi-fi networks; how these settings are configured

    can make a difference in the result. Not knowing what yours are set on

    is where you have to try and toggle some, to see if they help; then if not

    move them back to previous settings; as some are default.

     

    These settings are in various locations in the macOS, some right on the

    desktop, others in system preference network panels. You can toggle

    the wi-fi off and on, to see if that makes a difference. Actually, a restart

    to Safe mode (shift key held, after start tone, & until you see login) may

    help the system check & fix some files. When done, restart normally.

    In this safe mode, wi-fi may not work. The full system isn't booted.

    • Try safe mode if your Mac doesn't finish starting up - Apple Support

     

    • Manage the Wi-Fi connection on your Mac - Apple Support

    Of this, most seems basic to me; helps to go through the setting

    and re-set them again. Change from what they are, save, then go

    back to the one you wanted. Even if it was already set. In some

    instances, the 'repair permissions' in Disk Utility may help, but it

    also may be sketchy as to if it really did. But it cannot hurt.

     

    Sometimes interference in the location of your wireless network may over

    power the signal and the Mac won't see that on restart. If the base station

    or wi-fi, router AirPort, etc is near a stronger signal such as microwave oven

    and or some cordless phone frequencies, these can stop wi-fi from working.

     

    •Troubleshooting AirPort and Mac Wi-Fi problems | Computerworld

    www.computerworld.com/.../troubleshooting-airport-and-mac-wi-fi-p

     

    {While attempting to compile this reply, the ASC site (only reply page) froze

    and so I had to 'cancel' then later refresh pages to see they were still online

    then re-type; sometimes I was able to copy+paste saved text manually. A

    few times I was able use some 'auto-saved' content. The problem is when

    only the ASC discussion reply panel does not auto-save, then goes in-op.}

     

    If the wireless network at some other location works OK (at Apple Store or

    a safe internet café, or a library, etc) then you may want to look into the

    local environment for interference sources. Other electronics that emit a

    signal near the wi-fi band of your wireless base. Also if you have an AirPort

    with Dual Band read about how to test & reset it; you can choose what items

    use one band or the other in some cases. Otherwise it may be automatic.

     

    • Resetting an AirPort base station FAQ - Apple Support

     

    • AirPort + Wi-Fi: AirPort Base Stations - Apple Support

    https://ssl.apple.com/support/airport/basestations/

     

    My AirPort wi-fi base stations are older models, and generally just work.

    Could be if your base station has a pending firmware update, read up before

    you apply because some software updates only make troubleshooting harder.

     

    At times, some peripherals connected to the Mac can affect Wi-Fi. Some of

    the newer USB3.1 and or Thunderbolt items may affect the wireless. Test by

    disassociation; this may or may not provide more clues.

     

    In any event...

    Good luck & happy computing!