I was able to download files using the WinSCP GUI but when I tried to upload a file the entire file seems to transfer and then the session ended with the error "Error Decoding SFTP Packet (25, 4, 25). The file also showed the filepart extension. Of course my first thought was the problem was with the NetApp controller. I logged a support call with NetApp. NetApp performed testing and found their system was working correctly.
Since then I've used putty's psftp and FileZilla and both work without issue. So, while I can use WinSCP everywhere else without issue it appears there is a problem with NetApp. Now I have over 200 customers I plan to configure SFTP at and I'd really like to continue recommending WinSCP.
I have a document I put together with print screens showing each step I'm taking and exactly where the error occurs. It appears there is no way to attach it to this forum. If someone from support for WinSCP sends me an email I would be happy to send the doc your way.