For the error "Failed to start the database",
65432 is the default port used by the bundled Postgres.
ServiceDesk Plus will attempt to start the database if Pgsql / Mysql is used. If the database is standalone, stop it from starting by updating the StartDB parameter to false in nms-service.xml found under C:\Manageengine\ServiceDesk\server\default\conf.
Common privileges required for the ServiceDesk Plus DB.
Public
Sysadmin
DBCreator
DBOwner
Sample traces from Serverout0.txt for the issue logging into the database.