Thank you for your logging. However, I do not know the reason of
connection error in spite of investigation. Some idea must need to
proceed your problem.
So, I have a question and suggestion.
What is Terminal server
It seems that the server is OpenSSH 6.7 on Cygwin because I check below TTSSH.LOG.
Tue Feb 16 14:11:38.516 2016  Received server identification string: SSH-1.99-OpenSSH_6.7
Please retrieve the connection log by using ssh command. An example of command line
is shown below.
# ssh -vvv [Terminal server IP address]