StayLinked Clients will not allow you to configure the port as 23, since that is the common telnet port.
The StayLinked Server is a telnet client. The Server also provides a wide range of other options and features. StayLinked Clients are more like remote controls or remote desktop for telnet, since they request and operate a session but do not own the session. This is why you can reboot or turn off a device and it will always pick up where it left off. StayLinked Clients are not telnet clients and do not have any telnet settings. StayLinked Clients must connect to a StayLinked Server.
We have an installation checklist that helps describe the common steps to get set up found here.
Share the post "Invalid Port Range for port 23"