Resolving Wi-Fi Issues in macOS High Sierra

Fix Wi-Fi issues in macOS High Sierra

Some MacOS High Sierra users have reported issues with wireless networking after updating their Mac to the latest system software version. The problems may range from difficulties connecting to wi-fi networks, dropping wi-fi connections (particularly after waking from sleep), sluggish wireless speeds, and other frustrating connectivity problems with wi-fi networks.

This article will attempt to detail some common problems, and explain some troubleshooting steps to resolve wi-fi issues with macOS High Sierra.

Having Wi-Fi Problems in High Sierra? Update to the latest macOS High Sierra Update

Before doing anything else, if the Mac is currently on High Sierra then you should update to the latest version of macOS High Sierra that is available. Apple regularly releases software updates to system software, and macOS High Sierra is no different. If you are still running macOS High Sierra 10.13, then you need to update to the latest point release version available (10.13.1, 10.13.2, etc). This is easy, but you should always backup a Mac before installing any system software update.

  • Go to the  Apple menu and choose the App Store, then go to the “Updates” section and install any available system software updates to High Sierra

Point release updates often include bug fixes, and if you’re experiencing a problem that is related to a core system software bug then it’s possible the system software update will resolve that, possibly along with other reported problems

The bottom line: check for available system software updates and install them if any are available.

Is the Wi-Fi router SSID (name) hidden?

Some Mac users with MacOS High Sierra have reported difficulty connecting to wi-fi access points that have a hidden SSID.

You can try disconnecting and then connecting directly to the hidden SSID router in Mac OS, but the connection may drop again or fail upon waking from sleep.

One possible workaround is to make the SSID visible, this must be done on the wi-fi router itself and will vary per wireless access point, but if you have access to the wi-fi router it may be a solution. This works for many users, but obviously if you must have a hidden SSID for some reason then making the SSID visible is not always a viable option.

Does wi-fi only drop when macOS High Sierra wakes from sleep or screensaver wake?

Some users report that macOS High Sierra drops their wi-fi connection when waking from sleep or when waking from a screen saver, or that macOS High Sierra is slow to re-join wi-fi after waking from sleep.

You may be able to resolve wi-fi dropping after a Mac wakes from sleep by following the steps outlined below to create a new wireless configuration.

One reported workaround to wi-fi not re-joining after waking from sleep is the following:

  1. Go to the Wi-Fi menu and choose “Turn Off Wi-Fi”
  2. Wait a few seconds and then return to the wi-fi menu and choose “Turn Wi-Fi On”

Sometimes simply toggling the wireless capability off and on again is sufficient to resolve an inability to rejoin a wi-fi network. Some users are also reportedly turning off wi-fi before they sleep their Mac, and then enabling it again once their Mac is awake.

Another possible workaround is to use caffeinate at the command line, or an app like Caffeine or KeepingYouAwake, or sleep corner, to temporarily prevent sleep while those functions are activated. This is obviously not much of a solution if you must sleep a Mac.

Of course, workarounds are inconvenient and they are not true solutions. If you’re experiencing wifi connection problems then try the steps below to potentially resolve them.

Creating a New Wi-Fi Configuration in macOS High Sierra

Back up your Mac before continuing, these steps involve removing system level configuration files. Do not proceed without a backup made so that you can roll back if something goes wrong.

  1. First, turn off wi-fi by pulling down the wi-fi menu bar item in the upper right corner and selecting “Turn Wi-Fi Off”
  2. From the Finder, create a new folder onto the desktop (or another user folder) and call it something like “WiFiConfigBackup”
  3. Go to Finder in macOS, and pull down the “Go” menu, then choose the “Go To Folder” option
  4. Enter the following directory path into window and then click on “Go”
  5. /Library/Preferences/SystemConfiguration/

  6. Find and select the following files that are located within the now open SystemConfiguration folder
  7. com.apple.airport.preferences.plist
    com.apple.network.eapolclient.configuration.plist
    com.apple.wifi.message-tracer.plist
    NetworkInterfaces.plist
    preferences.plist

  8. Drag those files into the folder “WiFiConfigBackup” you created in the second step (alternatively, if you’re advanced, have a backup, and know what you’re doing, you can remove them)
  9. Restart the Mac by going to the  Apple menu and choosing “Restart”, then let the Mac boot up as usual
  10. Return to the Wi-Fi menu in the upper right corner and choose “Turn Wi-Fi On”, and then join the wireless network as usual

Essentially what this is doing is ditching your old wireless preferences and causing MacOS High Sierra to replace them by generating new wi-fi preferences. For many users, this is sufficient to solve any problems with wifi networking.

Optional: Make a New Custom Network Location

If you’re still having wi-fi problems after ditching the preferences and rebooting the Mac, you can try the steps below to create a new network location with custom configuration settings.

  1. Go to the  Apple menu and choose “System Preferences”
  2. Select the “Network” panel then choose “Wi-Fi” from the list
  3. Near the top of the preference panel, pull down the “Location” menu and select “Edit Locations” from the dropdown
  4. Create a new location in Network preferences

  5. Click the [+] plus button to create a new network location, name it something like “FixWiFiCustomConfig” or whatever is easily identifiable to you, then click on “Done”
  6. a new network location to resolve some wireless networking problems

  7. Alongside Network Name, pull down the dropdown menu and select the wi-fi network to join, enter the password if applicable
  8. Click on the “Advanced” button in the corner of the Network preference panel
  9. Choose the “TCP/ IP” tab and click on “Renew DHCP Lease”
  10. renew DHCP to get DHCP info filled in automatically

  11. Next go to the “DNS” tab, and within the “DNS Servers” section click on the [+] plus button then add the following IP addresses (one entry per line, by the way these are Google DNS servers, you can use others if you’d prefer but these are particularly easy to remember and ubiquitous):
  12. 8.8.8.8
    8.8.4.4

    add custom DNS settings to improve DNS lookups

  13. Next, select the “Hardware” tab and set the ‘Configure’ option to “Manually”
  14. Adjust the “MTU” option to “Custom” and set the number to “1453”
  15. The custom MTU setting in network preferences

  16. Now click on “OK”
  17. Finally, click on “Apply” to set the network changes you just made for the new network location
  18. Exit out of System Preferences
  19. Open Safari or Chrome, and visit a website – it should load fine

This sequence of trashing wi-fi preferences, generating new wireless preferences, and then, if need be, creating a new network location with custom DNS and MTU are a longstanding set of steps for resolving various wireless problems in many versions of Mac OS, including Sierra, El Capitan, and before.

High Sierra Wi-Fi still not working?

If you’ve done all of the above and you’re still having issues with wireless networking, you can try some general troubleshooting tips too;

  • Try to connect to a completely different wi-fi network, if wi-fi works fine with other networks it could be an issue with the router
  • Connect a completely different device to the same wi-fi router, does it work fine?
  • Try adjusting the wi-fi router channel, or using 2.4GHZ instead of 5GHZ (or vice versa)
  • If all else fails and wi-fi worked fine before using High Sierra, you can downgrade macOS High Sierra to a prior version of macOS assuming you made a backup with Time Machine before updating to High Sierra. Downgrading is rather dramatic and should be considered a last resort

Did you have any problems with wi-fi in macOS High Sierra? working fine for you in macOS High Sierra?

Is there any way to shorten the available Wi-Fi list in macOS and iOS? Unfortunately, no

macOS and iOS displays a list of the Wi-Fi networks in your area, whether they are private or not. This can be helpful, but how often are you able to really use a private network you can see but know nothing about?

Macworld reader Michael is irritated by the huge list of Wi-Fi networks around him whenever he tries to connect in iOS. He’s in a densely populated city, and neighbors’ networks are all around him. Since he’s connected to his own network and he’ll never connect to any of the others, is there a way to make them not appear in his list?

It’s a good question and one I honestly never thought about in 17 years of writing about Wi-Fi. The network scanning features built into Wi-Fi user interfaces on every platform I can think of that let you select a network are designed to maximize what you see. They weren’t created for crowded network environments, and a re-think would make a lot of sense, since we mostly don’t want to connect to any network, nor see them.

However, for now you’ve got to ignore it. When you click the Wi-Fi menu in macOS or visit Settings > Wi-Fi in iOS, you’ll always see the currently connected network at the top, but all the other networks will always appear.

There is one not-so-convenient-and-easy way you could solve this problem. Install a wire mesh in the floor, ceiling, and the inside portion of your home’s exterior walls to create a Faraday cage, which blocks penetration of a lot of forms of electromagnetic fields—which includes radio signals—and you’ll likely only see other networks when you open the front door.

Ask Mac 911

We’ve compiled a list of the questions we get asked most frequently along with answers and links to columns: read our super FAQ to see if your question is covered. If not, we’re always looking for new problems to solve! Email yours to mac911@macworld.com including screen captures as appropriate, and whether you want your full name used. Every question won’t be answered, we don’t reply to email, and we cannot provide direct troubleshooting advice.

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Apple iOS 11.1, macOS 10.13.1 Patch KRACK WiFi Flaw

Apple released updated versions of its mobile iOS and desktop macOS operating systems on Oct. 31, patching a critical WiFi security vulnerability known as KRACK that was first publicly disclosed on Oct. 16.

The iOS 11.1 and macOS 10.13.1 updates patch multiple software flaws associated with the KRACK WiFi vulnerability disclosure. KRACK is an acronym for Key Reinstallation Attacks and was discovered by security researcher Mathy Vanhoef working at Belgian University KU Leuven. 

“An attacker in Wi-Fi range may force nonce reuse in WPA clients (Key Reinstallation Attacks – KRACK),” Apple warned in both its iOS and macOS security advisories.

KRACK is actually a series of related vulnerabilities that could enable an attacker to reuse or replay WPA2 WiFi encryption handshake keys to gain access to an encrypted WiFi data stream.

“Attackers can use this novel attack technique to read information that was previously assumed to be safely encrypted,” the KRACK vulnerability disclosure warns. “The attack works against all modern protected WiFi networks.” 

iOS 11.1 patches a single KRACK vulnerability identified as CVE-2017-13080, while macOS 10.13.1 patches three KRACK issues (CVE-2017-13077, CVE-2017-13078 and CVE-2017-13080).

“A logic issue existed in the handling of state transitions,” Apple’s advisory warned about the KRACK issues. “This was addressed with improved state management.”

Although KRACK was publicly disclosed on Oct.16, Vanhoef worked with CERT/CC to conduct a coordinated private disclosure that was sent out to impacted vendors, including Apple, on Aug. 28. A number of vendors, including Aruba, Cisco, Red Hat, Juniper Networks, ZyXEL, Samsung, Intel and Microsoft, had a patch for KRACK on or before Oct. 16. While Apple is one of the last major vendors to patch for the KRACK vulnerability, to date there have been no major reports of any known attacks in the wild.

KRACK isn’t the only vulnerability patched in iOS 11.1. Thirteen other flaws, of which six are memory corruption issues in the WebKit browser rendering engine, were also patched. macOS 10.13.1, meanwhile, has patches for 146 identified vulnerabilities in total. The majority of those vulnerabilities are being resolved with updated packages for the tcpdump networking library, which had 88 flaws.

Among the interesting updates in macOS 10.13.1 is one for the 802.1X protocol authentication library identified as CVE-2017-13832 that was due to the use of Transport Layer Security (TLS) 1.0. TLS 1.0 is an older encryption standard that has multiple known and publicly exploited vulnerabilities.

“An attacker may be able to exploit weaknesses in TLS 1.0,” Apple’s advisory warns. “A protocol security issue was addressed by enabling TLS 1.1 and TLS 1.2.”

Sean Michael Kerner is a senior editor at eWEEK and InternetNews.com. Follow him on Twitter @TechJournalist.

TPCAST Announces Wi-fi Adapter for Oculus Rift, Arriving Q4 2017 – Road to VR

TPCAST, the organization recognised for making a wi-fi adapter for HTC Vive, introduced that they’ll be delivering a device that supports the Oculus Rift by the conclude of the yr.

Update (10/19/17): TPCast has offered further clarification that their wi-fi solution for Rift is a separate device from these Vive-only models offered in China and Europe.

If you possess a Pc VR headset (aka ‘tethered’), you’ve probably currently mastered the strange dance you have to do to untangle the cable in the course of room-scale gameplay. The cable, housing within it an HDMI and details/power-transmitting USB wire, is probably just one of the finest restricting variables to making the room-scale working experience genuinely immersive.

image courtesy TPCAST

TPCast maintains their answer can transmit up 5 meters absent at 2k (2160×1200) with a latency of much less than 2ms. Battery power, offered by an external powerbank, is mentioned to very last up to 5 hrs.

This is accomplished via a head-mounted transmitter that attracts latest from a 20,000mAh power bank. The signal is transmitted by the two a dedicated WiFi router for details and a particular receiver attached to your Pc for online video.

The organization first introduced its Vive-only transmitter in China 6 months ago and has been filling orders until eventually it went out of stock just recently. Though pre-orders for the transmitter aren’t readily available in the US any longer (Microsoft’s pre-purchase website page has because disappeared), the European industry is anticipating pre-order delivery later this 7 days from its several distributors.

TPCast maintains their “Wireless Adapter for Oculus Rift” is slated to arrive “by the conclude of Q4 2017.” It’s unclear in what capacity Rift assistance will get there, no matter whether it be in a dedicated Rift-unique device, or a device that supports the two Rift and Vive. We’ve arrived at out to TPCast for comment, and will be updating before long.

“TPCAST is committed to assistance the Oculus Rift HMD with our exceptional wi-fi engineering alternatives, and provide VR consumers a higher-high-quality, immersive VR come upon,” mentioned Michael Liu, TPCAST CEO. “With the TPCAST wi-fi adapter, we will be altering the VR usage and working experience by offering the complete liberty of movement with no cables.”