python - Heroku refuses connection to postgres database -

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i trying deploy flask app based on postgresql on heroku, when try create table db.create_all() keep getting error:

(psycopg2.operationalerror) not connect t rver: connection refused     server running on host "localhost" (127.0.0.1) , accepting     tcp/ip connections on port 5432?

here how code looks like:

app=flask(__name__)  app.config['sqlalchemy_database_uri']='postgres://kfgriimpfjecsv:bk1*****g@localhost:5432/dd71doth8gopgh' db=sqlalchemy(app) if __name__ == '__main__':     app.debug=true     app.run()

i using heroku toolbelt communicate heroku servers. also, when try this: 

psql -p 5432 -h localhost

i same error: 

psql: not connect server: connection refused         server running on host "localhost" (127.0.0.1) , accepting         tcp/ip connections on port 5432?

i tried ec2-23-21-215-184.compute-1.amazonaws.com instead of localhost in uri, got same error.

and here complete traceback when run db.create_all():

any idea why connection being refused , how solve this?

it seems had append sslmode parameter database uri, changing second line following solved problem:

app.config['sqlalchemy_database_uri']= "postgresql+psycopg2://kfgriimpfjecsv:bk1*******g@ec2-23-21-215-184.compute-1.amazonaws.com:5432/dd71doth8gopgh?sslmode=require"

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