Carefully plan your application updates and password rule changes before activating MIXEDCASE. Once MIXEDCASE is activated, subsequently issuing the SETROPTS PASSWORD(NOMIXEDCASE) command might cause unintended results. When you reset to NOMIXEDCASE, users who have mixed-case or lowercase passwords will be unable to enter the system until you reset their passwords.

If you use a mix of applications that do and do not support mixed-case passwords, do not activate the SETROPTS PASSWORD(MIXEDCASE) option.

If you have implemented RRSF, see RRSF considerations for mixed-case passwords.