SFTP with client

[Mark Allen <scprideandms@xxxxxxxxx>]

I have a customer who is switching effective immediately (this Friday) and
they want is to connect using the server name they specified (which I do see
connections to) and port 13266.

We can't seem to get it working and my secureftp knowledge is limited and
their "i5" skills are none existent.  They are saying that the user name and
password from the clients they have "automagically" get passed but that the
limit of their technical details.  Screen shot below on what happens below
what I am using for the Connection:

FTP RMTSYS(EXTERNALFTP.XXXXXXX.COM) PORT(13266) SECCNN(*SSL)

Connecting to host EXTERNALFTP.XXXXXXX.COM at address 2xx.xx8.xxx.xxx using
port 13266.
SSH-2.0-1.36 sshlib: GlobalScape   ---> this is where the "Vendor" says it
is hanging up.

Is there some "simple" piece I am missing on the FTP command line or another
"vital" piece I am blank about?