Core FTP

I am still testing the software, I found so far on a few instances, the server will work perfectly first time, but other times no.
The problem I seem to run into most is after setting up, I can't connect to it.
Router set to Port opened 2222 trans to 22
On Server2012, I have allowed CoreFTPsevrer public and private access, plus port 22 opened
Yet on some test machines this will work first time, while others like this one currently testing, no

Using Core FTP LE , I get the following error when trying to connect
Connection socket #1632 to xxx.xxx.xxx.xxx, port 2222
SSL/TLS error -0, SSL error -1, error 00000001:lib(0):func(0):reason(1)
SSL Connection not established

On the Core Server console I turned on View Activity and all it is showing is :
connecting
connected
disconnected ()

What am I doing wrong or missing here ?

assuming you are running SFTP on port 22...

This is the wrong protocol type (FTPS) being used:

SSL/TLS error -0, SSL error -1, error 00000001:lib(0):func(0):reason(1)
SSL Connection not established


when you should be using SSH/SFTP "connection" type