com.pega.pegarules.internal.bootstrap.PRBootstrapDataSource. Unable to connect to database. Will only use properties from file.
java.sql.SQLException: Cannot create PoolableConnectionFactory (FATAL: the database system is starting up)
It means You have a database communication link problem. Make sure that your application have network access to your database (and the firewall isn't blocking ports to your database).
Alternatively try this approach.
1.Go to PRPCPersonalEdition\pgsql\pgAdmin 4\bin,launch pgadmin3/4 and connect to database.
2.password will be postgres/postgres.
3.then hit the url again,If it doesn't work then reinstall prpc.