macOS treats networks connections as entries in the Network preference pane. When you add a hardware connection, like an ethernet port that’s part of a Thunderbolt dock, the preference list should automatically update to include it. But readers find that sometimes entries disappear. This is particularly common with Wi-Fi for reasons that aren’t apparent.
You can re-create a missing Wi-Fi interface entry (and that of any other interface). The steps are simple:
- Go to System Preferences > Network.
- Click the plus sign in the lower-left corner of the window.
- Wi-Fi should appear in the Interface popup menu. If so, select it. (If not, read below.)
- Enter whatever descriptive label for Service Name you like; just
- Click Create.
This process should re-create the Wi-Fi connection on your computer. If this newly created entry doesn’t have the intended effect, your Wi-Fi hardware may be faulty, or the system may need to be reinstalled. Read this Mac Wi-Fi interface troubleshooting column.
This Mac 911 article is in response to a question submitted by Macworld reader Harriet.
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Source : Macworld