I once had trouble with a client who used his business data solution for uploading data to our server (we support FTP, FTPS and SFTP, and we recommend SFTP + ke

I once had trouble with a client who used his business data solution for uploading data to our server (we support FTP, FTPS and SFTP, and we recommend SFTP + keys). It was an old java-based application with no updates, no SFTP support, and all attempts at FTPS failed in the face of certificate issues (outdated list of CAs, no ability to force a certificate). The client had no understanding of the issue and the technician was an expert for this specific business application, with no ability (or willingness, maybe) to write any sort of script or workaround outside that application.