Thanks for updating with the <lf> vs. <crlf> issue. We just noticed this and I was getting ready to update when I saw your post. </crlf></lf>
I know this is old, but it appears that you are using CoZ:SFTP on the z/OS side. Can you try specifying the remote file as: /-/!DTS4.UP.G5TB.S60301 This is one of the documented formats for specifying z/OS file names in the CoZ:SFTP documentation.
Identification string invalid based on RFC4253