FTP is not layered on Telnet; they're independent. SFTP is not layered on SSH, but it is secure only when running under SSH or an equivalent.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Paul Gilmartin <[email protected]> Sent: Saturday, January 24, 2026 6:59 PM To: [email protected] <[email protected]> Subject: Re: Filezilla - Xfer to ZOS USS filesystem? External Message: Use Caution On Sat, 24 Jan 2026 22:46:03 +0000, Seymour J Metz wrote: >"That" is Telnet. > >Internet Engineering Task Force (IETF) > >Start with Request for Comments: 6530: Overview and Framework for >Internationalized Email <https://datatracker.ietf.org/doc/html/rfc6530>, RFCs >6531-6533. > >There ss RFC 2066, but that's experimental. > >It seems the want you to use SSH. > <https://en.wikipedia.org/wiki/Telnet> Telnet transmits all information including usernames and passwords in plaintext so it is not recommended for security-sensitive applications ... Is FTP layered on TELNET even as sftp on ssh? I had thought not. sftp and ssh both use port 22; TELNET uses 23 and FTP 21. When you mentioned email, I imagined a successor to RFC 822. I know of no internet standard straying from CRLF. If one wants Windows conventions, it's better to use Windows software than WSL. -- Thanks, gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
