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).

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.

For file access 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.

Mac OS X users can also use OpenSSH (provided with MacOS 10.2 and later). Open the Terminal application, and type “ssh” for help.

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/

For Pocket PC/ Windows CE devices, sshCE (although untested) might be suitable. From www.movsoftware.com.

For PalmOS, you can try TGssh.

There is a java-based SSH client, Mindterm, available from http://www.appgate.com/, which with a suitable JVM can run on Unix, Windows, Macintosh, and other systems.

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.

• OpenSSH is available as a part of cygwin, at http://cygwin.com/ (free/open-source). Directions for installing it can be found at http://tech.erdelynet.com/cygwin-sshd.html. There is also an OpenSSH for Windows project at http://lexa.mckenna.edu/sshwindows/, which is designed for easy installation.
• VShell is a commercial SSH server from Van Dyke software.

• http://www.openssh.com/, free version of SSH suite. Unix-based.
• http://www.freessh.org/ has more links to free SSH software and information.