The esayer way is to make your password very difficult to guess. Make password minimum 6 character with upper and lower cases with numbers like: T3oyo4ta
Toyota with two numbers. Password also begins with upper charachter!
The best passwords are password without any meaning!!! But remember this password is now bad because I wrote it down, so somebody can see it!!!
BTW: you probably don't have problems with DRDA users, becuse AIX has no such connections. DRDA is only for mainframe systems like z/OS, VSE/ESA, VM and AS/400.