How to use Power BI designer preview to access a postgresql database

We have a postgresql 9.1 database which we want to connect to Power BI Designer Preview. I’ve setup the machine according to the instructions given in support.office.com
I am getting a error displaying:
DataSource.Error: PostgreSQL: Failed to establish a connection to <IP>.

Hi,
Did you provide your username/password through the Power Query credential dialog?
What authentication method is the database configured for?
Tristan
Hi Abhirich,
Have you been able to successfully authenticate the user after considering the questions presented by Tristan?
Regards,
Michael Amadi
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