User security checks that a user is authorized to attach a given transaction. It causes a second check to be made against a user signed on to a terminal in addition to link security. Levels of user security are set using the ATtachsec parameter of the CICS connection definition.
The ATtachsec operand specifies the logon requirements for incoming transaction attach requests. When an APPC session is bound, each side tells the other the level of attach security user verification that is performed on its incoming requests. There is no negotiation on this.
ATtachsec = Local specifies that a user identifier or password is not required. The link security is considered sufficient for that system, and the transaction sender (client) need not provide further security information. Any user ID and password information, if it is received, is ignored. CICS makes the user security profile equivalent to the link security profile.
A non-local ATtachsec parameter requires a user identifier, or a user identifier and a password. The following are some non-local values:
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