Unable to connect an app to IIS server running postgresql - postgresql

Question

I realise this will be a very vague post. We have a new server running Windows server. It turns out it was not setup fully.
It was missing the IIS webserver.
I have set up IIS, installed PHP7 using Web Platform Installer, and tested the connection through a psql PDO connection. We have an android app which communicates to the database via php, it uses a PDO connection. The app works when we point it to our old server 192.168.1.102 but it gives an error when we direct it to the new server 192.168.1.100
I've added these extensions to the php.ini file:
extension=php_pgsql.dll
extension=php_pdo_pgsql.dll
Here is the contents of the db connection which was setup by someone else a few years ago:
<?php
class PgDB {
private $dbConnection;
function __construct() {
$this->dbConnection = new PDO('pgsql:dbname=' . PG_DB .';host=' . PG_HOST . ';user=' . PG_USERNAME . ';password=' . PG_PASSWORD);
$this->dbConnection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$this->dbConnection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
function getDB() {
return $this->dbConnection;
}
}
And here are the connection parameters (with sensitive information replaced by <>, note both files lack the ?> ending for some reason, I assume poor practice to exclude this?
<?php
/**
* Created by PhpStorm.
* User: msenol
* Date: 02.04.2015
* Time: 11:57
*/
// PG info
define("PG_HOST", "192.168.1.100");
define("PG_PORT", "5432");
define("PG_DB", "<database name>");
define("PG_USERNAME", "<usrname>");
define("PG_PASSWORD", "<pw>");
// SQL Fields
define("TYPE", "reading_location");
define("HUE", "hue");
define("LIGHTNESS_VALUE", "lightness_value");
define("CHROMA", "chroma");
define("DESCRIPTION", "description");
// Image Upload Path
define("BASE_IMAGE_PATH", "e:/gygaia/images/");
define("TEST_MODE", false);
I used the standard script to connect and was successful.
<?php
$dsn = "pgsql:host=$host;port=$port;dbname=$db;user=$user;password=$pw";
try{
// create a PostgreSQL database connection
$conn = new PDO($dsn);
// display a message if connected to the PostgreSQL successfully
if($conn){
echo "Connected to the <strong>$db</strong> database successfully!";
}
}catch (PDOException $e){
// report error message
echo $e->getMessage();
}
$conn = null;
?>
We are all at a loss, and we need the system up and running since we are on fieldwork.