On initial installation of PostgreSQL typically you will also download and install pgAdmin III on your local PC to assist in Postgres management. The pgAdmin GUI will assist in viewing database information quickly, etc. In one of my installations I was not able to connect to the new Postgres installation via pgAdmin and I was not receiving errors. Typically the issues I might have are related to the password not being correct or various GRANT permissions.
I had configured all of the initial items that I usually do which included the below.chkconfig, iptables, Linux, pgAdmin, postgres, PostgreSQL, psql, selinux, tcpdump