Configuring data sharing groups as servers through SNA
DRDA requesters can access any member of a data sharing group through SNA if the SYSIBM.LUNAMES table of the communications database contains a default row that enables access by any requester that is not defined by a row in the table.
Installation job DSNTIJSG normally
creates a default row unless the installation process has been altered
to remove that step. If the SYSIBM.LUNAMES table does not contain
a default row, you must, for each DRDA SNA
requester, insert a row that contains the LUNAME of that requester.