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Question: 10.13 High Sierra Wi-fi issue

Update process from 10.12 to 10.13 on mid-2011 iMac was uneventful. However, an issue is that after a shutdown/restart or waking from sleep, wi-fi won't automatically connect. Turning wifi off/on doesn't change anything. Wireless network SSIDs are hidden, so they don't usually (sometimes do) show up in the network list. After clicking "turn wifi on", when they show up in the network list, choosing one will make the connection. Steps I've taken:

  • Reboot wireless router
  • Remove existing wifi configuration files from /library/preferences/systemconfiguration, followed by reboot
  • Create new profile, reboot, still no automatic connection
  • Added a couple of DNS servers ( and .4 for now). This didn't change anything
  • For the first time in forever, did an SMC reset, which didn't change anything

There were no wifi issues with Sierra 10.12, so this is new.

Open to any ideas. TIA!

null-OTHER, macOS High Sierra (10.13), null

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Oct 3, 2017 7:31 AM in response to BGreg In response to BGreg

The have the same issue on a late 2009 iMac update from Sierra to High Sierra. I've manualy deleted the Wi-Fi and network configuration files, create a location ... After a lot of test I have found your solution and it has worked to me.

I also own a late 2013 MacBook Pro which I have updated from Sierra to High Sierra with no Wi-Fi issues.

Then this might be an iMac issue or for older Apple computers.

Thank you for posting your solution it has been helpful to solve my iMac Wi-Fi issue.


Oct 3, 2017 7:31 AM

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Oct 4, 2017 2:50 AM in response to jrfromnb In response to jrfromnb

Downgraded my MBP 13 (Late 2016) back to OSX 10.12.6 sierra but this doesn't help anymore.

I now also have trouble connecting using OSX10.12.6 Sierra, looks like this also applies to de USB-Lan adapter

My MBP Retina (Mid2012) still runs flawless on OSX 10.12.6 Sierra, I don't dare to upgrade it

My wifi broadcasts 2.4Ghz but I will try to change it to 5Ghz tonight, who knows maybe it will help

Oct 4, 2017 2:50 AM

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Oct 4, 2017 7:16 AM in response to jrfromnb In response to jrfromnb

Having the same issue with a 2015 27” iMac, keeps dropping the connection, will not connect etc. 2 laptops, along with numerous iPads etc all connect to the WiFi with no issues. Using High Sierra public release along with beta 1. All of the Public Beta releases of High Sierra worked fine

My ISP has checked everything and the router does not appear to be at fault, have had to resort to wired connection.....

Oct 4, 2017 7:16 AM

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Oct 4, 2017 1:22 PM in response to HuwPNE In response to HuwPNE

Clean Install High Sierra 10.13.0 on late 2012 iMac without any issues. Computer will auto connect to 5 Ghz wifi after idle and after wake from sleep but am getting Broadcom Driver crashing at least twice since the clean install Oct 1. Reading the crash logs something about power stat =0 that correspond to time of waking from sleep.

Have had similar issues as this one on Retina MacBook only happening on Sierra 10.12.6

No solution for either machine except to kill wifi altogether when certain not needed for extending period of time or in Terminal run caffeinate -i.

Oct 4, 2017 1:22 PM

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Oct 7, 2017 12:14 PM in response to BGreg In response to BGreg

Found a solution.

Same issues that everyone here is reporting.

I am on ATT giggabit.

ATT had me update the SSID from the default SSID and that instantly fixed all of the connections issues.

Try updating your SSID and PW in your router settings. Or you can contact your net provider to do it for you.

Oct 7, 2017 12:14 PM

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Oct 9, 2017 4:55 PM in response to BGreg In response to BGreg

I have fixed this issue in early-2015 Macbook Pro by changing the host name (SSID) of my Wifi Repeater/Extender. Before this, my Macbook randomly on & off wifi or sometimes won't connected at all, and I had Wifi Router and Repeater with a same host name. I hope this help. 🙂

Oct 9, 2017 4:55 PM

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Oct 12, 2017 1:10 AM in response to BGreg In response to BGreg

Similar problem here on iMac 27" (mid2010). Vintage, but still performing i7-16GB machine.

WiFi doesn't automatically connect anymore trusted networks after upgrading to High Sierra.

Tested many work-around procedures (turned off/on WiFi card, tried on different routers, changed SSID of router/s, changed from 5GHz to 2.4GHz band on router, reset MSP on iMac, reset NVRAM on iMac, deleted WiFi settings folder on iMac, reinstalled WiFi card on iMac, clean installation of High Sierra onto an external usb drive, and much more..) but nothing solving.

Also found/installed a clean "El Capitan" OS version onto an external usb drive, the problem disappeared, so clearly not a problem on network card.

Currently in touch with Apple experts to find a suitable solution (OS side ?).

Oct 12, 2017 1:10 AM

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Question: 10.13 High Sierra Wi-fi issue