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→Understanding the lokkit Firewall Customization Screen
'''SSH''' - The secure shell provides an encrypted mechanism for allowing password protected remote access to your system. With SSH you can remotely log into to your system, copy files to and from your system and anotehr system and perform remote execution of programs. If you need remote access to your system you will need to activate this. If you do not need remote access leave this disabled. Note that the ssh server is not installed by default on Ubuntu Linux.
'''Telnet''' - Telnet provides remote terminal access to your system. It does not use encryption and use is strongly discouraged. Leave this disabled and use SSH instead fopr remote access. When you have finished making selections tab to the ''OK'' button to return to the main screen and tab to ''OK'' again to exit ''lokkit''.
'''FTP''' - Controls whether File Transfer Protocol traffic is permitted through the firewall. Unless you plan to set up an ftp server (unlikely for typical users) leave this option disabled. Note that the FTP server is not installed by default on Ubuntu Linux.
To activate or deactivate a option use the ''Tab'' key to navigate to the required option and press the space bar to toggle the selection. Activated options are marked with an asterisk (*). When you have finished making selections tab to the ''OK'' button to return to the main screen and tab to ''OK'' again to exit ''lokkit''.