On z/OS there is no concept of a "privileged user"

Technote (troubleshooting)


On z/OS there is no concept of a "privileged user".


You are on z/OS WebSphere MQ v7.1 and trying to activate CHLAUTH. You run into a problem with the *MQADMIN test which does not appear to work the same on z/OS as it does on AIX.


On z/OS there is no concept of a "privileged user". In the WebSphere MQ Information Center, z/OS isn't listed in the platforms for privileged users.

Resolving the problem

You might consider using the USERLIST attribute in the SET CHLAUTH command and *MQADMIN on the different platforms.

Channel authentication
Inquire Channel Authentication Records (Response)


    A list of up to 100 user IDs which are banned from use of this channel or set of channels. Use the special value *MQADMIN to mean privileged or administrative users. The definition of this value depends on the operating system, as follows:
    • On Windows, all members of the mqm group, the Administrators group and SYSTEM.
    • On UNIX and Linux, all members of the mqm group.
    • On IBM i, the profiles (users) qmqm and qmqmadm and all members of the qmqmadm group, and any user defined with the *ALLOBJ special setting.
    • On z/OS, the user ID that the channel initiator and queue manager address spaces are running under.
    For more information about privileged users, see Privileged users
    ( http://publib.boulder.ibm.com/infocenter/wmqv7/v7r1/topic/com.ibm.mq.doc/zs00150_.htm)
    This parameter is only valid with TYPE(BLOCKUSER).

Essentially, on z/OS the *MQADMIN value will ONLY block the user ids that the MSTR and CHIN address spaces are started under.

When securing channels, you might consider using a "back-stop" rule to control access as described in the following developerWorks article: CHLAUTH - the back-stop rule.

Product Alias/Synonym


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Document information

More support for:

WebSphere MQ

Software version:


Operating system(s):

OS/390, z/OS

Reference #:


Modified date:


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