This document explains how to check and fix errors when a scanner connects and then terminates.
Check the KTS log folder.
Check for any errors during login process - ip is banned.
Note internal IP BAN.
To clear - goto IP-BAN folder and remove IP Address file.
Check the KTS.INI file.
Consider IP = 0 or increase the connection count to reduce the chance of IP BANS. Default is 10 - here it was increased to 100.