It looks to me like "550 T" is the start of the FTP message type 550, Requested action not taken. Doesn't seem like something the server should be sending in the middle of a CLIENT-HELLO negotiation. But I'm no expert.
Is it safe to assume that non-z/OS clients are successfully connecting to this server? ________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of John S. Giltner, Jr. <[email protected]> Sent: Monday, March 1, 2021 4:49 PM To: [email protected] <[email protected]> Subject: Re: FTP-SSL from z/OS client to Linux Well in the data you sent out on the client hello I only see two x'35', on is at byte 3,which is part of the length field. The other is at 2C which really starts at 2B which is cipher x'0035' In your 1st post the trace showed part of a error message that I think you were receiving which as "550 T". Were you receiving that message and if so what was the full message. You know it just hit me that "5" in HEX (ASCII) is x'35'. Maybe the client is sending the error message that starts "550 T" and your side it interpreting that error message as part of the TLS negotiation and it has no idea what a x'35' is. ---------------------------------------------------------------------- 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
