Why my mac can not access the Internet even though it has been connected to the WiFi? But other devices connected to the same WiFi can access the Internet.

If you happen to meet this problem, the following methods may help.

Step 1: Choose Apple menu > System Preferences.

Step 2: Click Network.

Step 3: Then click on Advanced. You will see this in the bottom-right corner of the window.

Step 4: Click DNS, then click the Add button at the bottom of the DNS Servers list.

Step 5: Then click on the plus icon (+). You will see this at the bottom of the DNS Servers pane.

Below is a short list of commonly used public DNS servers. Secondary DNS servers can be added to add a layer of redundancy.

Step 6: When you're finished, click OK and Apply.

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Step 1: On your Mac, choose Apple menu > System Preferences, then click Network.

Step 2: Click the Location pop-up menu, choose Edit Locations, then click the Add button(+).

Step 3: Enter a name for the location, then click Done.

Step 4: Click Apply.

Step 5: Switch Network Location. Click the Apple menu, select “Location,” and then chose the location that you want to become active.

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Step 1: Choose Apple menu > System Preferences.

Step 2: Click Network.

Step 3: Then click on Advanced. You will see this in the bottom-right corner of the window.

Step 4: The Wi-Fi pane shows a Preferred Networks list. Select the Wi-Fi network that you want your Mac to forget.

Step 5: Click the remove button (–) beneath the list. If you're asked to confirm, click Remove.

Step 6: Click OK and Apply.

Step 7: Click the Wi-Fi menu and choose Create Network. Enter the details for your network, such as a network name and channel.

Step 8: Reconnect to the WiFi network you set, click Auto-Join for it, and put it first in the WiFi list to set it as Preferred (Default) WiFi Network.

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Step 1: Choose Apple menu > System Preferences.

Step 2: Click Network.

Step 3: Then click on Advanced. You will see this in the bottom-right corner of the window.

Step 4: Select the Proxies tab then uncheck all protocols under Select a protocol to configure then click OK once done.

Step 4: Click Apply.

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Due to frequency interference, the working frequency of USB3.0 and the WiFi frequency of Mac may interfere with each other, causing the Mac to fail to connect to WiFi. If you need to use the USB interface, please try to buy a USB 2.0 Hub to avoid interference problems.