Re: SSL API Issues after latest CUM PTFs on V7R3

We have had these errors since we went to 7.4 on Labor Day. After
changing ciphers and putting on all the latest PTF groups, we now have
this very strange symptom: these errors "(GSKit) Peer not recognized or
badly formatted message received." are only happening between the hours
of 6am through 10am (we may get 1 or 2 outside of this time frame).

I have just installed that ptf (MF67593 - 7.4 MF67570), so let's see what
tomorrow brings.

On Thu, Oct 1, 2020 at 4:07 PM Brad Stone <bvstone@xxxxxxxxx> wrote:

Info from IBM that a customer got:

-APAR MA48442 (“OSP-OTHER-UNPRED SYSTEM TLS FAILS TLSV1.2 SERVER HELLO
WITHOUT EXTENSION DATA LENGTH”)
-Update a few PTF Groups to current levels
-Apply PTF MF67593, which isn’t in any PTF Group.

So it does seem to be an IBM issue that has already been (hopefully)
fixed. I will know for sure after the weekend.

I tried searching for PTFs but that seems futile these days... unless I'm
just not understanding how their newer searches work...lol.

On Thu, Oct 1, 2020 at 10:07 AM Brad Stone <bvstone@xxxxxxxxx> wrote:

Hi, Jeff.

I haven't seen any issues with Google, no. I just am wondering if it's

an

issue with only certain endpoints. It's hard to tell. I am hoping to

hear

from one customer to see what IBM tells them.

On Thu, Oct 1, 2020 at 9:36 AM Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx>
wrote:

Is this 7.3? Would this possibly affect my using G4G uploading PDFs?

Asking because I'm set to IPL and apply some PTF groups tomorrow night.

Thanks.



On Thu, Oct 1, 2020 at 10:23 AM Brad Stone <bvstone@xxxxxxxxx> wrote:

I have a few customers that seem to be reporting an issue with the

IBM

SSL

APIs after applying a recent PTF group when using GETURI (HTTPAPI

also

reports the same issues) communicating with a web service.

Also from tests using cURL and PHP on the IBM i the error cannot be
reproduced, neither can it on the PC using Postman, etc.

Randomly they are receiving the error:

415 - Peer not recognized or badly formatted message received.

If the standard SSL APIs are used RC is normally -16 if I recall.

One customer was able to work with a trading partner and they did a

trace

on their end and tracked it down to the "Hello" communications from

the

IBM

i during SSL negotiation.

What they saw and explained was something like this:

"...When everything is working fine we have noticed the server hellos

are

super small …376 bytes which is an indication of TLS session reuse.

Then

there is an attempt to do TLS reuse with a different proxy or backend
server and it fails which is likely this TLS FATAL illegal parameter
error. The NEXT server hello is much larger, 3586 bytes, because the

TLS

session is trashed and has to start over.


It then works for a while with the little server hello's doing

session

reuse ... until a proxy or backend server gets switched and it blows

up

and

starts all over..."


So, when this error is reported on the IBM i seems to correlate with

what

they see on their end where the TLS session is "trashed".


My suspicion is that a recent PTF broke this, since it worked for

years

previously and after the PTFs this behavior started.


I have the customer contacting IBM to see when they can find with all

this

information, but I am just curious if anyone else is experiencing

this

issue and what they have found.


Thanks.


Bradley V. Stone
www.bvstools.com
Native IBM i e-Mail solutions for Microsoft Office 365, Gmail, or any

Cloud

Provider!
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Jeff Crosby
VP Information Systems
UniPro FoodService/Dilgard
P.O. Box 13369
Ft. Wayne, IN 46868-3369
260-422-7531
direct.dilgardfoods.com

The opinions expressed are my own and not necessarily the opinion of my
company. Unless I say so.
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