How to reset Mac Network
Close any apps that use the network.
Such as turn off Wifi, unplug network cable, bluetooth.
Click the Finder icon. It’s the two-toned smiling Mac logo in the Dock, which is usually at the bottom of the screen.
Press ⌘ Command+⇧ Shift+G. This opens the Go To Folder window.
Type or paste /Library/Preferences/SystemConfiguration/ into the blank.
Click Go. This opens a list of System Configuration files.
Select all of the network-related files in the folder. Here’s how:
Press and hold the ⌘ Command key.
Click all of the following files (while continuing to hold ⌘ Command):
All selected files should now be highlighted in blue.
Delete those files.
Restart your Mac.