Mac WiFi not working? No web connection? If you are having WiFi problems we have some fixes for you to try, including ways to strengthen your WiFi signal.

Most of us take having an always-on wireless internet connection for granted: we're used to it just being there when we need it. Unless you're particularly unlucky and plagued by broadband problems, or live in a remote part of the country, fast access to the internet, allowing the streaming of audio and high-definition video, is the norm.

When things go wrong with your WiFi or your broadband connection it’s not just your email you’ll be missing, but also your social networking life and your evening’s entertainment in the form of a back to back Netflix session.

There are usually three reasons why your WiFi isn’t working: either there's a problem with your router, your broadband provider's network is down, or there's an issue with your own WiFi network. There’s one other possibility - there may be an issue with the MacOS software you are running.

1. Check Apple’s software

In the past when Mac users have updated their computers to a new version of Mac OS X they have encountered WiFi problems. This was a big issue with the original version of Mac OS X El Capitan: following the update many users found their Macs could no longer connect to their WiFi network.

Apple did issue an update to the software, but this wasn’t an easy fix for MacBook Air owners who could only connect to the web via WiFi. When we had this problem we had to update our Mac to the new version of OS X while sharing the connection from our mobile phone. You may well have to do the same if it’s a software update you need, in which case do be careful about going over your data allowance! (Read our tips for sticking to your data allocation on your iPhone here).

2. Check for Apple’s Wi-Fi recommendations

When your Mac attempts to connect to a WiFi network in macOS Sierra, it checks for issues. If your Mac detects an issue your will see WiFi Recommendations in the WiFi status menu, which you can access by clicking on the WiFi logo at the top left of your screen (it looks like a monocrome rainbow).

If there is an issue with your network you will see the option Wi-Fi Recommendations in the menu there. Apple recommends you read these.

3. Check with your broadband provider

If the problem is at the broadband provider's end, there's not much you can do about it beyond complaining - and you should absolutely do that.

Even if the broadband providers network isn't down, it might still be their problem (or BT’s problem). For example, sometimes the cabling to the house can be at fault, if your web connection often cuts out during bad weather it may be because water is getting into the cables.

4. Reboot your router

To establish whether the problem is with your router the first thing to do is turn it off and on again. To powercycle your router you need to disconnect it from power for about 30 seconds, then plug it in and turn it back on.

5. Reboot your Mac

As with the router, it’s also a good idea to turn your Mac off and on again.

Once you have rebooted, if there is still an issue try turning the WiFi off and then waiting a few seconds before turning it back on again to force it to scan for available networks again.

To turn WiFi off and on again click on the rainbow like WiFi logo in the menu at the top right of your Mac and select Turn WiFi Off.

6. Disconnect Bluetooth

Try disconnecting Bluetooth, this is a fix that has worked for some people.

7. Forget the network

You may find that forcing your device to forget the network can help. Turn off Airport, go to System Preferences > Network > Advanced and select the network you wish to forget, press the (-) and agree to Remove.

Once you have done this your Mac and other devices using your iCloud Keychain will not join that network.

Now try connecting to the network again, adding the password when requested.

8. Keep your router cool

If things still don’t work, check your router isn’t overheating. Don’t cover it up or hide it away where there isn’t adequate ventilation because if it gets too hot it won’t work as well.

9. Check you router’s location

Another thing to check is your router’s location. You will get a better signal if it’s not on or near any large metal surfaces - so don’t sit it on a filing cabinet for example and don’t put it right next to a radiator.

Move your laptop closer to your router and see if you get a signal from there. If it turns out the signal is fine when you are right next to the router it is likely that something in your house or office is causing interference.

10. Find out if something is blocking the signal

There are lots of reasons why the signal strength can be weaker in certain locations and not others. For example, thick walls in old houses can make getting a WiFi signal in one corner of the house impossible.

If there is a lot of metal in the building that can also cause issues with your WiFi, so it might be worth checking what materials were used in the construction of your property.

You can use an app called NetSpot (£8.99) [buy it here] to create a map the WiFi signal in your building. Move your Mac around and chart the signal strength in various locations to get an idea of where the WiFi signal is stronger, and weaker.

If you have identified the problem as being an issue with the signal strength in certain parts of your building we recommend getting a WiFi extender like one of these Powerline adaptors. When you set up the WiFi extender make sure you change the SSID (WiFi name) and password of the new device to the same as your current wireless router and modem to enable your Mac to pick whichever device is offering the better connection without you having to switch and enter a new password.

Alternatively the problem may be other electrical devices, such as electric fans, motors, microwaves and wireless phones. These devices can also cause WiFi signal issues. Does your WiFi drop at the same time as you use the microwave? Because your WiFi network and the Microwave are both using radio waves you can get interference when you turn your Microwave oven on.

Try to position your router far away from these devices.

11. Use Apple's Wireless Diagnostics

You can also get an idea of whether other devices are causing your signal to drop by using OS X’s built-in Wireless Diagnostics utility.

To generate a graph like the one shown using Wireless Diagnostics follow these steps:

  1. Open Wireless Diagnostics, either search for it using Spotlight: cmd+spacebar, or hold Option/Alt and click on the AirPort icon (the rainbow) on the righthand side of the top menu bar
  2. Before you click Continue to run a report, go to the menu and click on Window > Performance (or click Alt+Cmd+5)

This will generate three graphs that will tell you about the transmission rate, signal quality, and signal and noise levels. If you monitor this for a few hours you may be able to identify whether there is a problem.

The top graph displays the data rate in Mbps of your wireless network. The level of the graph will be dictated by your wireless router and other equipment you have connected to it. The important thing, in troubleshooting terms, is that the rate is reasonably consistent. If you are seeing dips in the data rate, or a complete drop off, it indicates that there is a problem.

The middle graph, labelled Quality, displays the ratio of signal to noise over time. Ideally, it should be a straight-ish line with small spikes. If you notice frequent dips in the line, it's likely that something is interfering with your WiFi signal.

The bottom graph, labelled Signal, displays both the signal strength and measured noise. Both are shown as dBM, or Decibel-milliwatts, a commonly used unit of the absolute power of radio signals. A reliable signal should have a signal strength of between somewhere between -60 and -10dBm and a noise level below -75dBm. The narrower the gap between the two lines on the graph, the more unreliable the signal is likely to be.

If you notice sudden increases in noise, the first thing to do is to try and identify when and why they occur. Does it happen, for example, when a wireless phone handset is in use, or when a microwave oven is switched on?

If you identify that a particular appliance is interfering with signals on your WiFi network, move the router away from the appliance that's causing the problem.

You could also try varying the height of the router as well as its horizontal position to see if that has any effect on the reception when the interfering gadget is in use.  

12. Check the competition

Your WiFi connection may also be suffering because of the other WiFi networks nearby. If you are in a particularly built up area it is likely that there are a lot of other WiFI networks sharing the radio waves with you.

To find out what other traffic is in your area your could try the WiFi Explorer app (£19.99), buy it here.

WiFi Explorer will help you see what other WiFi networks are in your area and will give you a lot more information that you normally see in the list of available networks on your Mac that you can see if you click on the rainbow-shaped Airport logo in the menu bar.

13. Choose a unique network name

Now you have seen these different WiFi networks make sure you configure your WiFi network with a unique name so that it doesn’t conflict with the names of other nearby networks.

14. Change your WiFi channel

You could go some way to counter competition from other WiFi networks by changing the channel you are on, there are 13 channels, and of them all but 1, 6 and 11 overlap. You’d be wise to pick a channel as far away from your neighbours' if possible.

Routers do a good job of selecting channels automatically, based on what else is operating nearby. If, however, you open the Scan tool from the Windows menu in Wireless Diagnostics and notice that your router is operating on the same channel as another router nearby, you might want to consider changing it manually.

The steps you need to follow to change the channel on your router will depend on your router software. To access your router software you need to know the IP address of your router. Most routers have an IP address of http://192.168.0.1 or http://192.168.1.1, although BT routers are usually http://192.168.1.254.

Open your web browser and type the IP address into the address bar and press enter. This will bring up your router software. Look for the channel information and log in to your router to change it.

Don't just move it to the next available channel, however. Channel frequencies overlap meaning that narrowband use five channels concurrently and wideband routers use seven. So, if you manually change channels, make sure you move at least five or seven channels away from the one your router is currently operating on.

As you make changes, keep monitoring the graphs in Wireless Diagnostics so you can see which ones make a significant difference to signal quality.

Alternately you could configure your WiFi network channel to Automatic so that it selects the best channel to use.

15. Use the 5GHz band

Those channels mentioned above relate to the 2.4GHz band. Another way to improve your WiFi signal could be to switch to the 5GHz band. However in the UK there are some legal limits to this band regulated by Ofcom. Essentially this means in the UK 5GHz WiFi are more restricted than the same WiFi networks in the US. For this reason switching to 5GHz in the UK won’t necessarily fix your problem in the same way as it might in the US.

However, you could still try switching to the 5GHz band. The 5GHz band offers more bandwidth than the 2.4GHz band and is less susceptible to interference because other domestic appliances don't use that frequency.

To use the 5GHz band on your dual-band router you’ll need to first separate the 2.4GHz and 5GHz networks on your router (check its manual to find out how to do it) and give them different names. If you have an AirPort Extreme or Time Capsule, the option is in the Wireless tab of AirPort Utility.

Click the Wireless Options button at the bottom of the window and click the box next to '5GHz network name.' Now give it a different name.

Once you've separated the 2.4GHz and 5GHz networks, you need to tell your Mac and iOS devices to join 5GHz in preference to 2.4GHz. In macOS, go to the Network Preferences pane in System Preferences, click on WiFi, then the Advanced button, and drag the 5GHz network to the top of the list. On an iOS device, tap on Settings, then WiFi. Tap on the 'i' next to the 2.4GHz network, and slide 'Auto-Join' to off.

16. Check your security settings

One piece of advice is not to hide your network - it might sound like this makes things more secure, but it doesn’t actually protect it and can cause reliability issues.

Instead, if you want your network to be secure, use WPA2 Personal security.

17. Run Apple Diagnostics  

If you still haven’t solved your WiFi worries your could use Apple Diagnostics to check for WiFi or network issues.

To do so follow these steps:

  1. Disconnect all external devices (except the keyboard and screen)
  2. Shut down the Mac, then turn it on while pressing and holding D.
  3. When you see the screen asking you to choose your language do so, then watch as the progress bar indicates that your Mac is being assessed, this takes 2-3 minutes.
  4. If there are problems Apple Diagnostics will suggest solutions

18. Reset your SMC, PRAM or NVRAM

How to reset the PRAM on a Mac and resetting the SMC (System Management Controller) are covered here: How to reset your Mac's NVRAM, PRAM, and SMC.

19. Change the DNS setting for your network

Changing your DNS settings is also recommended, but like resetting SMC, PRAM and NVRAM it’s not for beginners.

You need to start by deleting your WiFi preference files (but we advise you to back them up first!)

  1. Find the WiFi preferences by opening the Finder and choosing Go > Go To Folder and typing: /Library/Preferences/SystemConfiguration/
  2. In this window locate the following files and drag them to clearly labelled back up folder on your Desktop:
    com.apple.airport.preferences.plist
    com.apple.network.identification.plist
    com.apple.wifi.message-tracer.plist
    NetworkInterfaces.plist
    preferences.plist
  3. Reboot the Mac
  4. Turn on WiFi and see if it works (hopefully it does)
  5. If WiFi doesn’t work you need to create a new WiFi network location, adding custom MTU and DNS details
  6. Before you do this, quit any apps that might be using WiFi or the network
  7. Go to System Preferences > Network and choose WiFi. Click on the menu beside Location and choose Edit Locations, click the + to create a new location and name it something memorable. Click Done.
  8. Join the WiFi network, using your usual router password.
  9. Click on Advanced and under the TCP/IP tab choose Renew DHCP Lease. Go to the DNS tab and add 8.8.8.8 and 8.8.4.4 to the DNS Servers list (those are the Google DNS, which are generally the fastest options, but you can add something else if you prefer).
  10. Choose Hardware and Configure Manually
  11. Change MTU to Custom and set it to 1453, click OK and Apply

If you decide that the probelm is with your router and cannot fix it, perhaps it's time to buy a new router. You could have a look at out round up of the Best routers for Mac here.