Postgres and Ambari Error

Hey

Namaskara~Nalama~Guten Tag~Bonjour

I am getting the following error :

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ERROR: Exiting with exit code -1.
REASON: Ambari Server java process died with exitcode 1. Check /var/log/ambari-server/ambari-server.out for more information.

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Exception in thread "main" com.google.inject.CreationException: Guice creation e
rrors:

1) Error injecting constructor, java.lang.RuntimeException: org.postgresql.util.
PSQLException: Connection refused. Check that the hostname and port are correct
and that the postmaster is accepting TCP/IP connections.
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Anyone can help?

Thanks