For information on CICS Transaction Gateway security validation refer to the following:
IBM documentation CICS Transaction Gateway z/OS Administration or the CICS Transaction Gateway Administration Guide for your specific operating system, available at: http://www-306.ibm.com/software/htp/cics/library/cicstgv5.html
Readme.txt for CTG 5.1 provided on the CTG 5.1 installation CD_ROM
APAR OW55570 (for RACF)