Because since Windows FTP doesn't "do" SFTP, it won't work. You can't throw a TLS handshake at a port that isn't going to recognize it and react appropriately. That's what I keep harping about: AT-TLS is *great*, I'm not dissing it at all; but it's not magic, you can't just add it at random and say "Now <some connection> is encrypted so it's all good". It has to work, too, and won't if that connection isn't expecting a TLS handshake.
So yes, it can talk to Linux; it can connect to any thing that's expecting TLS. If you had a text-based browser, you could do a GET to http://www.google.com/ and it would work, and the Google end would think you were using https (because you would be). Your process wouldn't know that, would think it was using http. Alan says Filezilla supports FTPS, so no need for AT-TLS with Filezilla. -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Billy Ashton Sent: Tuesday, September 17, 2024 4:40 PM To: [email protected] Subject: Re: Is z/OS FTP encrypted? I am curious about AT-TLS and why not consider it? Is AT-TLS only for use when two mainframes are communicating, or would it work if the server is a Linux or other OS machine? Then, is it only a mainframe client that can use the AT-TLS connection, or could Filezilla use it when connecting to a mainframe or other server? Thank you and best regards, Billy Ashton ------ Original Message ------ >From "Alan Altmark" <[email protected]> To [email protected] Date >9/17/2024 2:19:59 PM Subject Re: Is z/OS FTP encrypted? >Windows native FTP doesn't support FTPS (FTP with RFC 4217 - aka negotiated >or explicit TLS). Filezilla does (and has z/OS support). The FTP client >that comes with PCOMM does (I'm not talking about 3270 file transfer). There >are others. > >Don't mess with AT-TLS for this. z/VM and z/OS added the support for RFC >4217 so that there's no question about what is and isn't encrypted. > >Alan Altmark >IBM > >---------------------------------------------------------------------- >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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
