The secure terminal server on IGEL OS is a network service, providing a TLS/SSL-encrypted Telnet session. Reducing the number of running network services reduces the system's attack surface. Even more so in this case, as Secure Terminal by design enables a remote user to execute commands on the system.
Instructions
By default, Secure Terminal is not active. Should you want to deactivate it at any time, do the following:
In IGEL Setup go to System > Remote Access > Secure Terminal
Uncheck Secure Terminal.
Click Apply.
Secure Terminal can be enabled globally in UMS under UMS Administration > Global Configuration > Remote Access. There you can also enable logging of users of Secure Terminal.