As explained in knowledge base article A4000009 we have made some changes to the mechanism used for communication between DP4 applications and the database manager and terminal manager. You need to use these updated versions if you download recent bug fixes to Unix programs in the bug fix section.
4.520 for application programs, 4.521 for ADCs and networking components. Please refer to knowledge base articleA4000009 for more information.
This software may be installed on customer sites. However it has not been formally validated by us at this time, so before installation please ensure that it operates correctly on the intended configuration.