Mac can't connect to wifi, can't join the wifi network, please try to get close to the wireless router, or, run "unlimited diagnostics" to troubleshoot

Symptoms: You can connect to wifi at first, some wifi frequently drops, and then you can't connect to any wifi at all. It is unclear whether the vpn software is installed on the computer.

Error: failed to join the wifi network, please try to get close to the wireless router, or, run "unlimited diagnostics" to troubleshoot

Cause: There is a problem with the network configuration and needs to be reset

Solution: Delete all files and folders except com.apple.Boot.plist under the Macintosh> Library> Preferences> SystemConfiguration folder, and then restart.

Thanks: https://blog.csdn.net/zhao15127334470/article/details/81633939