After applying maintenance to ESP Workload Automation Agent for z/os, connection was not established between Agent and ESP Workload Automation Dseries Server.
Component: ESP Workload Automation Agent for z/os
Release: 11.4
After the Agent is restarted need to make Dseries Manager re-establish connection. Go to Dseries Topology and update the Description field and refresh. This will send a connection request to the z/os agent and wake up the connection.