Sometimes I run into issues with my macOS wireless. Yes I know that most problems come by myself by wrong configurations. But here now a very handy short way which helped me already many times. Attention! You will need it to rejoin the network.
# change directory $ cd /Library/Preferences/SystemConfiguration/ # list files (optional) $ ls -la # delete specific files $ rm com.apple.airport.preferences.plist com.apple.network.identification.plist NetworkInterfaces.plist preferences.plist
Finally reboot the system and join your network. This forces the macOS to create all preference files again.