Stack access control provides a way to allow or disallow users or groups of users to access a TCP/IP stack. The TCP/IP stack to be protected is represented by the resource EZB.STACKACCESS.sysname.tcpname in the SERVAUTH class. If you have a RACF® profile protecting this resource, the RACF subsystem address space user ID must have access to it.

For more information, see the section on stack access control in z/OS Communications Server: IP Configuration Guide.