Re: Secure FTP (FTPS) battle when moving to V7R4

I've only ever seen -16 when the wrong port is used trying to connect to an
SSL/TLS system.

For example, if you try to use SSL to connect to port 80 on a web site,
that is the error you will get.

Seems FTP client is using the old IBM SSL APIs as well. According to IBM
they are legacy and don't support SNI either.

On Fri, Feb 14, 2020 at 11:40 AM Troy Hyde <troy.hyde@xxxxxxxxxxx> wrote:

Thanks Stefan & Justin but I think/hope we've gotten beyond the cipher
suite part.

A trace on the server side's connection indicates that they are seeing the
cipher negotiation and accepting a cipher.

We're fighting the -16 (peer system is not recognized) issue right now.

---------- Forwarded message ----------
From: Stefan Tageson <Stefan.Tageson@xxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx

Cc:
Bcc:
Date: Fri, 14 Feb 2020 14:17:17 +0000
Subject: RE: Secure FTP (FTPS) battle when moving to V7R4
Hi,
This is how it looks like in an lpar not far from here 😊
V7R4:
Sequence Cipher
number Suite
0
10 *AES_128_GCM_SHA256
20 *AES_256_GCM_SHA384
30 *CHACHA20_POLY1305_SHA256
40 *ECDHE_ECDSA_AES_128_GCM_SHA256
50 *ECDHE_ECDSA_AES_256_GCM_SHA384
60 *ECDHE_RSA_AES_128_GCM_SHA256
70 *ECDHE_RSA_AES_256_GCM_SHA384

The first three lines are new, the others are found in V7R3 as well.

V7R3:
0
10 *ECDHE_ECDSA_AES_128_GCM_SHA256
20 *ECDHE_ECDSA_AES_256_GCM_SHA384
30 *ECDHE_RSA_AES_128_GCM_SHA256
40 *ECDHE_RSA_AES_256_GCM_SHA384
50 *RSA_AES_128_GCM_SHA256
60 *RSA_AES_256_GCM_SHA384
70 *ECDHE_ECDSA_AES_128_CBC_SHA256
80 *ECDHE_ECDSA_AES_256_CBC_SHA384
90 *ECDHE_RSA_AES_128_CBC_SHA256
100 *ECDHE_RSA_AES_256_CBC_SHA384

From line 50 and below have not made it thru V7R4

TLS 1.0 and TLS 1.1 are disabled out of a V7R4-box.

Best regards

stefan.tageson@xxxxxxxx
M +46 732 369934

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