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Secure Shell (SSH) is the recommended replacement for telnet for remote access to Unix and VMS systems. Similarly, Secure File Transfer (SFTP) replaces FTP. Ssh can also be used to tunnel less-secure protocols and make them work over restricted firewalls.
We recommend SSH Secure Shell Client. The installation includes a Secure File Transfer client which is a very useful replacement for FTP. You can obtain the installer from our software download page.
A second option is SecureCRT, from http://www.vandyke.com/. SecureCRT has slightly better terminal emulation than the ssh.com product. We have a large number of licenses for an older version of this (v3.3). You need to enter this license information. ADCS also offer licenses for the current version of SecureCRT, which is preferable in some ways (for example, it allows multiple sessions in different tabs of the same window). Directions for using, here
There are also a few free clients, such as PuTTY.
For file transfer (SCP or SFTP), we suggest using SSH Secure Shell Client (above), or WinSCP.
SSH is provided with Mac OS already.
For remote file access over SSH, we recommend Macfusion, from http://www.macfusionapp.org/. Note that before installing this program you must have MacFUSE, from http://code.google.com/p/macfuse/, installed.
Most modern Unix systems come with a form of SSH already installed. If not, the standard is OpenSSH from http://www.openssh.com/.
A useful Guide to getting started with ssh can be found at http://kimmo.suominen.com/ssh/
Unix and Mac OS X users can use OpenSSH to provide SSH and SFTP servers
A few SSH servers are available for Windows systems. Although they should not be installed carelessly, they may be useful for secure file transfer or other purposes.