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Topic:WebSphere MQ call failed '2400' ('MQRC_UNSUPPORTED_CIPHER_SU
zpat

Replies: 13
Views: 11346

PostForum:IBM MQ Security Posted: Tue Jan 12, 2021 11:59 am Subject: WebSphere MQ call failed '2400' ('MQRC_UNSUPPORTED_CIPHER_SU
The SSL context says IBMJSSE2

Do they need to enable TLS 1.0 somewhere? I know some patching levels of Unix disable it.
Topic:WebSphere MQ call failed '2400' ('MQRC_UNSUPPORTED_CIPHER_SU
zpat

Replies: 13
Views: 11346

PostForum:IBM MQ Security Posted: Tue Jan 12, 2021 5:37 am Subject: MQRC 2400 Possible Causes?
WAS 8.5.5 on RHEL
MQ Z/OS 9.0.0 QM

WAS is getting a MQRC 2400 (Cipher not supported).

What are the possible causes of this?

Cipher is set to SSL_RSA_WITH_AES_128_CBC_SHA
Topic:Effect of shared conversation on CHIN/MCA overhead
zpat

Replies: 20
Views: 4375

PostForum:General IBM MQ Support Posted: Wed Dec 02, 2020 9:41 am Subject: Effect of shared conversation on CHIN/MCA overhead
These CHINs are on production Z14s - not hitting 100% CPU overall.
Topic:Effect of shared conversation on CHIN/MCA overhead
zpat

Replies: 20
Views: 4375

PostForum:General IBM MQ Support Posted: Sat Nov 28, 2020 11:50 pm Subject: Effect of shared conversation on CHIN/MCA overhead
I don't have a pass to enter the hallowed portal of z/os systems programming.

Before I risk disturbing the demi-Gods, what sort of issue are you suggesting here?
Topic:Effect of shared conversation on CHIN/MCA overhead
zpat

Replies: 20
Views: 4375

PostForum:General IBM MQ Support Posted: Thu Nov 26, 2020 11:12 pm Subject: Effect of shared conversation on CHIN/MCA overhead
In prod - 96 adapter, 60 dispatcher, 8 SSL tasks.
Topic:Effect of shared conversation on CHIN/MCA overhead
zpat

Replies: 20
Views: 4375

PostForum:General IBM MQ Support Posted: Thu Nov 19, 2020 4:44 am Subject: Effect of shared conversation on CHIN/MCA overhead
The issue is that for various reasons the developers of an application (already in production) want to change their connection model from one connect - many messages, to one connect - one message.

...
Topic:Effect of shared conversation on CHIN/MCA overhead
zpat

Replies: 20
Views: 4375

PostForum:General IBM MQ Support Posted: Thu Nov 19, 2020 3:53 am Subject: Effect of shared conversation on CHIN/MCA overhead
This blog is interesting (The cost of connecting to a z/OS queue manager)


https://community.ibm.com/community/user/imwuc/viewdocument/the-cost-of-connecting-to-a-zos-qu?CommunityKey=b382f2ab-42f1 ...
Topic:Effect of shared conversation on CHIN/MCA overhead
zpat

Replies: 20
Views: 4375

PostForum:General IBM MQ Support Posted: Wed Nov 18, 2020 11:18 pm Subject: Effect of shared conversation on CHIN/MCA overhead
So the question is really - does using shared conversations mitigate the increased overhead (e.g. 5 times the CPU) of making a fresh connection for each message for a MQ client application connecting ...
Topic:Effect of shared conversation on CHIN/MCA overhead
zpat

Replies: 20
Views: 4375

PostForum:General IBM MQ Support Posted: Tue Nov 17, 2020 7:43 am Subject: Effect of shared conversation on CHIN/MCA overhead
TLS 1.2 cipher is used. Network is internal so pretty fast. No exits.

I have observed 5 different connections with 10 conversations allowed (and active) per connections.

So it is re-using the TC ...
Topic:Effect of shared conversation on CHIN/MCA overhead
zpat

Replies: 20
Views: 4375

PostForum:General IBM MQ Support Posted: Mon Nov 16, 2020 5:49 am Subject: Effect of shared conversation on CHIN/MCA overhead
Let's assume we have an application which connects to MQ for every message that it puts/gets from their queues (request/reply) then disconnects.

I know this is not the best practice but what I woul ...
Topic:Relative overhead of ciphers on MQ channels z/os
zpat

Replies: 9
Views: 2397

PostForum:Mainframe, CICS, TXSeries Posted: Sun Oct 11, 2020 7:05 am Subject: Relative overhead of ciphers on MQ channels z/os
That restriction does not apply to z/OS MQ, already checked with the support center.
Topic:Relative overhead of ciphers on MQ channels z/os
zpat

Replies: 9
Views: 2397

PostForum:Mainframe, CICS, TXSeries Posted: Wed Oct 07, 2020 10:41 pm Subject: Relative overhead of ciphers on MQ channels z/os
Thanks for that. Yes I assume that z/OS 2.3 on a z/14 will use the cryptographic processor.

In fact the CHIN needs RACF read access to a resource in the CSFSERV class for the GCM cipher to work at ...
Topic:Relative overhead of ciphers on MQ channels z/os
zpat

Replies: 9
Views: 2397

PostForum:Mainframe, CICS, TXSeries Posted: Wed Oct 07, 2020 5:53 am Subject: Relative overhead of ciphers on MQ channels z/os
We have a MQ sender/receiver channel pair to another QM - one end is z/OS MQ v9.0 and the other end is z/OS MQ v9.1

It's high volume (hundreds per second) and currently secured with the TLS 1.2 ci ...
Topic:How to solve message retry delays impacting others
zpat

Replies: 19
Views: 4613

PostForum:General IBM MQ Support Posted: Wed Sep 30, 2020 4:16 am Subject: How to solve message retry delays impacting others


When it (the off mainframe app) works it does keep the queue depth mostly at zero.

But yes I was tempted to use an analogy like a Roll-Royce hitched to a Moped.
Topic:QSG CHIN high CPU / workload skew - why ?
zpat

Replies: 13
Views: 2961

PostForum:General IBM MQ Support Posted: Tue Sep 29, 2020 6:04 am Subject: QSG CHIN high CPU / workload skew - why ?
SCTQ "Message rellocation" can consume a lot of CPU, check for retrying channels.
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