Problems connecting php to postgresql remotely

Question

I’m trying to remotely connect postgresql to PHP on an Apache server. On my local machine I can run the connection without any problem. The point is that it is not working remotely.

I’m running the same code that ran on another instance of the same service cloud (changing only the IP). No error message is appearing and no code message appears indicating that the database has not been connected. I’m using an Ubuntu server 14.04. Could someone help me? I’m not finding the problem!

Checked:

• Postgresql MV configuration by psql via SSH connection and Pgadmin3 remotely. Both working perfectly.
• Definition of the ok password.
• pg_hba.conf configuration (as indicated in the contracted cloud service tutorial)

# Ipv4 remote Connections (all users and IP Addresses): host all all 0.0.0.0/0 md5

• Configuration of postgresql.conf (as indicated in the tutorial of the contracted cloud service)

  listen_addresses = '*'
  

• Firewall rules - ok.

• PHP code (the same code works perfectly on the local machine and worked in another instance of the same cloud service).

  <?php 
  
     $host        = "host=xx.xx.xx.xx";
  
     $port        = "port=5432";
  
     $dbname      = "dbname=nomedabasededados";
  
     $credentials = "user=postgres password=senha";
  
     $db = pg_connect( "$host $port $dbname $credentials"  );
  
     if(!$db){
        echo "Error : Unable to open database\n";
     } 
  
   $sql = pg_query("INSERT INTO tabela (coluna1) VALUES ('valordacoluna1');");     
  
  ?>