TCPIP invokes z/os System SSL so if there is any documentation provided by IBM it will be in System SSL documentation but I could not find the record formats. System SSL provides the gsk trace command and it is possible that this will format the records for you. You will find the definitive explanation if SSL/TLS handshake records in RFC 8446 for TLS 1.3 which has references to earlier versions . These can be difficult to read but when I needed to understand SSL messages some time ago Googling for terms such as ‘SSL message format’ found several explanations of SSL message structure with examples. BTW I remember reading that z/os 2.5 includes improved diagnostics for handshake failures but I have not investigated further.
Keith > On 9 Dec 2022, at 16:47, Crusty Old Guy <devoutoccam...@gmail.com> wrote: > > >> >>> 0090 EZD1285I TTLS Data CONNID: 00000014 SEND CIPHER 1503020002020A >> The 1503020002020A is an SSL alert packet with a fatal error: Unexpected >> message > > This brief interchange comes from the archives. I need to find the meaning > of a different cipher. > > I've gone through "IP Diagnosis" and didn't find any clues. > > Can anyone help? > > Thank you, > COG > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
