DFLTUSER

The DFLTUSER system initialization parameter specifies the RACF® (Resource Access Control Facility) user ID of the default user; that is, the user whose security attributes are used to protect CICS® resources in the absence of other, more specific, user identification.

For information about how security works in CICS, see How it works: Identification in CICS. For information about defining the default CICS user ID to RACF, see Defining the default CICS user ID to RACF. For information about CICS initialization failures that are related to security, see CICS initialization failures related to security. For information about security-related system initialization parameters, see Security-related SIT parameters.

Defining DFLTUSER

You can define the DFLTUSER system initialization parameter in the following ways:

In the PARM parameter of the EXEC PGM=DFHSIP statement.
In the SYSIN data set of the CICS startup job stream.
By using a DFHSIT macro.

You cannot define the DFLTUSER system initialization parameter through the system console.

Values for DFLTUSER

DFLTUSER={CICSUSER|userid}: Valid values for the DFLTUSER system initialization parameter are as follows:
CICSUSER: CICSUSER is the default value for DFLTUSER. One of the user IDs that is associated with the CICS region to protect resources in the absence of other more specific user identification. For example, when a 3270 terminal session is started, the session is associated with the CICS default user ID until the user signs on.
userid: One of the user IDs that is associated with the CICS region that is associated with the tasks started when CICS starts.