The firewall is turned off by default.Reboot your computer to activate these changes.Once completed, open a terminal window and run sudo pfctl -f /etc/pf.conf to import the rules.Pass out proto udp from any to port 1300 Open the file /etc/pf.conf and edit it so that it contains the following rules (the ordering is important!), replacing with the IP address of the Mullvad server you wish to use.The following instructions will block everything in and out except via the IP address specified. Follow any on-screen instructions until you are connected.Click on the Tunnelblick icon in the menu bar and choose the Mullvad server that you imported.Make sure that OpenVPN version is set to 2.5.x or 2.4.x and not 2.3.x.Click on the Mullvad server configuration in the left column of the app.Click on the Tunnelblick icon in the macOS menu bar.
Follow the on-screen instructions to install the configuration file.Double-click on the Mullvad.tblk file to open it with Tunnelblick or drag it to the Tunnelblick icon in the macOS menu bar.Close TextEdit (the file will save automatically).Open the OpenVPN configuration file (mullvad_xx.conf) with TextEdit.