10.13 High Sierra Wi-fi issue

Changing from 5GHz to 2.4GHz solved it for me.

There is a supplemental update to 10.13.2. It may be related to the intel problem, but may be it also resolves the wifi issue.

I assigned a fix IP adress to the MBP MAC-adress and that fixed it for me.

same here, no issue with Sierra on my MBP Retina 15-inc (Mid 2015). Seems like only High Sierra my MBP is not connecting to the 5Ghz. Have no issue with connecting to the 2.4Ghz but not 5Ghz.

I would say there is a bug in the OS.

Quick update: in my case it’s most likely hardware issue with latest iMac 27” 5K 2017. Formatted hard drive and reinstall steps of MacOS give same issue. I’ll go to Apple service point for solution.

Of course Apple is going to blame the problem on everyone else. I too have a house full of other devices that do not have any problems. And they also said they did not slow down old iPhones for some time before they were forced to admit they actually were doing so with the excuse it is a battery issue. This is why I and many I know no longer trust Apple. I and others have switched and we now use android phones.

If you're using a USB-C dongle (adapter) with your MacBook Pro, there are some issues with WiFi being dropped and requiring a re-start while the dongle is unplugged. If are connecting any externals to your MBP, this video will fix the problem.

FIX for USB-C DONGLES MACBOOK PRO - YouTube

Sure, and while I am at it, might as well broadcast the PW (or better yet, disable a PW requirement altogether) alongside with with broadcasting the SSID . . .

Sorry about the sarcasm but my frustration level has reach its peak with this issue - just to make sure I get this right: is Apple telling us that going forward they will DISCOURAGE admins from hiding the WIFI SSID?

I understand the spirit of the suggestion being along the lines of "if you want an immediate quick-and-dirty solution here it is" and, having tried it successfully I concur that it works, but does anyone at Apple believe that this is even remotely acceptable as a long term solution?

As far as I am concerned, this is a major issue for High Sierra and Apple HAS to address it - however, if past performance is any indication of future response, I am not quite holding my breath.

Apple? You say what?

I can't reset cause that's blocked by the ISP, I can login to the router but all those settings are locked. On hardware reset the ISP gives it back the SSID name that is known with them and i'm not allowed to change the name and password.

2.4Ghz test:

Did iMac to sleep mode, waited few minutes, braught it back (wake) and logged in. CPU usage goes through the roof (kernel_task 100% in activity monitor, see usage graph below during that time and after it reconnects), you notice the slowness when moving the mouse gets bumpy. After a minute, the connected wifi drops out, iMac tries to reconnect and that takes a few minutes and then reconnects again. The CPU usage then comes to a more normal level (as the image clearly shows).

I had the same problem with my Mac Mini. For whatever reason the WiFi option was not detected by my Mac. Inexplicably everything suddenly started working again after 2 days with no access to the internet. I was sent a link to report the problem as feedback for Apple. Here is the link if anyone else wants to give feedback.

Product Feedback - Apple

5Ghz: Dragging it to the top should help you even adding back other networks.

DO NOT HIDE the network.

Router should be configured to 802.11a/n & if thats causing issues then try just the 'n'

Click Advanced and go to DNS settings and make sure Googles two are on top: 8.8.8.8 & 8.8.4.4

You may need to set manual MTU to 1453

20 or ""40 MHz

"You may need to change your 5Ghz channel from AUTO to 40, 41, 44 or 48; as an alternative.

Check if you don't know your current channel from wifi icon by holding OPTION while clicking.

Recommended settings for Wi-Fi routers and access points - Apple Support

Sounds good.

I'd say if reboots or shutdowns and power ons

don't eliminate the fix then it's probably persistent.

I'd make backup now.

The one I'm on now went out in only a few months.

If you're under warranty and it appears so, do so before it expires.

My SSID is already, and aways was, unhidden. I think this is not a solution. Maybe work´s for a time only.