CREATE EXTENSION dblink

SELECT *
    FROM dblink('dbname=db_name2 port=5432
            host=xx.xx.x.x user=username_db2 password=password_db2',
    'SELECT * FROM tableFrom_Db2');

ERROR:  a column definition list is required for functions returning "record"

SELECT dblink_connect('host=xx.xx.x.x user=username_db2 password=password_db2 dbname=db_name2');

ERROR:  could not establish connection
DETAIL:  FATAL:  no pg_hba.conf entry for host "IP_db1", user "username_db2", database "db_name2", SSL on
FATAL:  no pg_hba.conf entry for host "IP_db1", user "username_db2", database "db_name2", SSL off