It is not possible to start the AE server and the following error appears.
U0003590 UCUDB - DB error: 'OCILogon', 'ERROR ', '', 'ORA-12514: TNS:listener does not currently know of service requested in connect descriptor'
OS Version: All OS
The Oracle database is unreachable.
The solution is to make sure sure that the Oracle instance used by the AE server is reachable. Please check the section "ORA-12514: TNS:listener does not currently know of service requested in connect descriptor" in the following link for possible solutions.
Please contact your DBA for further assistance.