connection error

getting below error from application side :
========

Last acquisition attempt exception:

org.postgresql.util.PSQLException: Connection refused. Check that the
hostname and port are correct and that the postmaster is accepting TCP/IP
connections.

the port no is set correct :

[postgres(at)lxsqlptgsdev004 data]$ psql -h localhost -p 5432

psql (9.5.14)

Type "help" for help.

postgres=#

In pg_hba.conf also:

# IPv4 local connections:

host all all 127.0.0.1/32 trust

host all all 127.0.0.1/23 trust

host all all 172.29.161.53/23 trust

host all all 172.29.161.52/23 trust

Can someone please help what can be done to resolve this.

Thanks,

Sonam