A little more details would help us guide you through. What is your pega version? JBoss version? Complete error logs when this happens (including JBoss server.log). OpenStack itself may or may not be at fault here. I assume your other Pega functionality works even on this new platform? What are the differences between your lower JBoss env versus the current new UAT env (besides OpenStack, e.g., JBoss version, Pega version, etc).