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One of the most widely used applications of Secure-Shell-based products is to replace the unsecured login protocols, Rlogin, Telnet, and FTP with secure alternatives. The SSH Tectia client/server solution is based on SSH Secure Shell, used worldwide for secure system administration.
Figure 5.5 shows a typical SSH Tectia environment for secure system administration. In this example, the managed servers reside in the DMZ network, and the system administrator connects to them over the Internet using SSH Tectia Client. In this scenario, SSH Tectia Client software is installed in the system administrator's workstation and the SSH Tectia Server software in the managed server. SSH Tectia Server for IBM z/OS could be running at either end of the connection.