When setting up security for TCP/IP, the TCP/IP started task's user ID and its default group must both have an OMVS segment defined. The user ID, assigned using ICHRIN03 or the STARTED class, must have UID(0). For information about defining a z/OS UNIX user to RACF®, see Defining z/OS UNIX users to RACF.

Other TCP/IP tasks such as ftp and routed must be assigned a RACF user ID using ICHRIN03 or the STARTED class. If ftpd and routed use a different started task user ID from the TCP/IP user ID, they must have UID(0) and HOME(‘/’).