Bitesize Blogging: MQ V8 - CAF Removal
Morag Hughson 110000EQPN Visits (3637)
Another in the series of bitesize blog posts about features in MQ V8. Check out the whole series here.
In MQ V8, the z/OS Client Attachment Feature (CAF) was removed. What does this mean for you?
The CAF was a separately purchasable feature of WebSphere MQ for z/OS that allowed clients (that is network attached applications) to connect to a z/OS queue manager, In older releases of WebSphere MQ, if you did not purchase and install this feature you could not connect any clients to your queue manager. Only if you did would see this in your CHINIT joblog:-
CSQX011I !CSQ1 CSQXGIP Client Attachment feature available
In WebSphere MQ V7.1 you were allowed 5 client connections for free without the CAF installed (although only on specifically named channels). You would be reminded of this each time a client connected with this message:-
CSQX263E !CSQ1 CSQXRESP Client Attachment feature unavailable, admin channel SYST
In MQ V8, the CAF no longer exists and the ability to connect clients to your z/OS queue manager is included in the base feature of the product. You will now see this in your CHINIT joblog:-
CSQX011I !CSQ1 CSQXGIP Client attachment available
If you intend to make use of client applications connecting into your z/OS queue manager, you should ensure you have appropriate security around those connections. MQ V8 provides a number of new features to help you with that. See more about the security features in MQ V8 here.
If you do not intend to make use of client applications then you should ensure that no-one else can use them to connect to your queue manager either! There are a number of ways you can ensure that no client application can connect to your queue manager now that not installing the CAF isn't on the list.
If you have other SVRCONNs apart from the ones that are created by default, you should also do the same to them. Issue
DISPLAY CHANNEL(*) TYPE(SVRCONN)
to see how many you have.
This decision to remove the CAF on V8 has also been applied to WebSphere MQ V7.1 on z/OS. If you apply APAR PI13429 you can connect clients to your V7.1 queue manager without the need to purchase and install the CAF.
Morag Hughson is the WebSphere MQ Base Architect
Find her on: and within IBM on: