Default and alternative TCP ports for direct serial port access

A direct network connection to a serial port can be established using the "high TCP ports" convention.  Each serial port access network service (e.g. SSH, Telnet) has a corresponding network Base Port.

When configured, direct access to a specific serial port is served on the Base Port + the Serial Port #.  For example, the base port of SSH is 3000 so to SSH directly to serial port 4 you would SSH to TCP port 3004.

The default base ports used for direct access to serial ports are:

Service	TCP Base Port
Telnet	2000
SSH	3000
Raw TCP	4000
RFC2217	5000
Unauthenticated Telnet	6000
Unauthenticated SSH	7000

In addition to the default base ports, alternative base ports may be configured using the System -> Services -> Alternate ... Base fields.

Network services can be enabled for per-serial port using the service checkboxes under Serial & Network -> Serial Ports -> Edit -> Console Server Settings.

Access through the firewall may be configured per-interface and per-service using the System -> Services -> Service Access -> ... to serial ports rows.