ZMF 8.3 changed the behaviour of RACF password and password phrase processing for users connecting to a ZMF Server instance from non-mainframe user interfaces (e.g. ZDD, ZMF4ECL, zMobile, the Rest Services API web app, etc.). Specifically, the input password or password phrase is no longer automatically folded to uppercase even if the RACF PASSWORD(NOMIXEDCASE) option is set. Customers should ensure that they test these non-mainframe connections as part of their ZMF 8.3 mainframe software upgrade process to verify that these changes have no adverse impact in their particular environment.

Full information on this issue, including details of a hotfix that may potentially be required, can be found here.