Note that if you have a firewall enabled, Mac OS X automatically will open port 22 through the firewall, but this is not the case on Mac OS X Server. If the padlock is locked, click it and authenticate. ![]() In System Preferences, open the Sharing pane. To enable sshd on Mac OS X (it is automatically enabled when you install Mac OS X Server) using System Preferences, follow these steps: As a result, for best security, you should force SSH to only use version 2. Note that, by default, an SSH client attempting to connect to an sshd remote host will attempt to use version 2, but if it is unsuccessful (because the remote host does not support version 1), the client will then attempt a connection using protocol version 1. Version 1 has some known security holes and should be avoided. The current protocol version for SSH is version 2. The sshd daemon listens on port 22, so this port must be available (not blocked by a firewall) for those clients that wish to connect. The daemon that enables SSH functionality is sshd, which must be running on the remote host that you would like to log in to. ![]() On Mac OS X and Mac OS X Server, SSH is implemented using the open-source implementation OpenSSH. However, SSH is much more than a replacement for Telnet, although it does not duplicate the non-SSL socket access tests, for which Telnet is still very useful. In its simplest sense, SSH (Secure Shell), is a secure login replacement for rlogin, ensuring that the remote connection is completely encrypted, and that the password used for authentication is not sent in clear text.
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