IIS to Apache connection issue - php

Question

I am moving what looks like a pretty simple php/MSQL app from a Windows IIS server to a Cpanel/ Apache server. The app works fine on existing IIS/MySQL server using this format to connect:
<?php
class Connection {
var $conn;
var $user = 'XX0000XX_XXadmXX';
var $pass = 'XXXpasswordXXXX';
var $dbname = 'XXckbXXX_XXX13XX';
var $host = '74.0.0.0';
function Connection() {
$this->conn = mysql_connect($this->host, $this->user, $this->pass);
mysql_select_db($this->dbname,$this->conn) or die( "db-connect". mysql_error());
}
function closedb() {
//mysql_close(($this->host, $this->user, $this->pass ) or die( "db-close". mysql_error() );
mysql_close($this->conn)or die( "db-close". mysql_error() );
}
}
?>
I imported the DB into CPANEL/MySQL using PhpMyAdmin. 1st test failed due to $host not accepting IP address value. After changing IP to localhost - tested the connection with a DB connection script and that passed. The error is that at I can connect with the same username and PW as Windows server. But after logging in any link I click in the admin kicks me out.
Any clues would be helpful - let me know if I can provide any information that would help. I am thinking that there may be a windows specific change that needs to happen or something to do with the the DB host.
Here are some values in a settings file - before the Ip addresses were set with domain name - set with IP to test:
define('ADMIN_MANAGEMENT', "sitename");
define('FROM_NAME', "Admin");
define('SITE', "sitename");
define('SITE_NAME', "http://74.0.0.0/");
define('ADMIN_ID', "dwayne#fair.com");
define('KEYWORD', "sitename");
define('SITE_URL',"http://74.0.0.0/");
define('SITEIMGPATH', "http://74.0.0.0/public/images/");
define('ITEMS_PER_PAGE', "15");
define('PRODUCTS_PER_PAGE', "5");
define('UPLOAD_FILES', "uploads/files/");
define('UPLOAD_IMAGES', "uploads/images/");
define('SMALL_IMAGE_WIDTH',190);
define('SMALL_IMAGE_HEIGHT',77);
define('PROFILENAME', "Welcome to domain.com");
define('CARID',1000);
define('RESIZE_IMAGE_WIDTH',400);
define('RESIZE_IMAGE_HEIGHT',300);
/*Live path*/
define("ROOT", "http://" . $_SERVER["SERVER_NAME"] . "/admin/");
define("ROOTS", "http://" . $_SERVER["SERVER_NAME"] . "/admin/");