The validateDbConnection.sh does not return success. The DE server starts up and connects to the DB.
The ESP dSeries (WA DE) is on Linux VM.
There is likely can issue with random generation.
Release : 12.x
Component : CA WORKLOAD AUTOMATION DE
Verify if there is adequate entropy on the OS/host.
An output of 2000 or above is normally required from the above command. To increase the entropy level available to the system install an rng tool.
For Red Hat based systems user may user rng-tools