Want to build a LAMP environment on VirtualBox

I want to build a LAMP environment on VirtualBox.
We installed the operating system and middleware in the following environments:

• OS:Centos 6.5
• PHP 5.3
• Apache 2.2
• mysql 5.1
• Perl
• phpMyAdmin-4.5.0.2: Under /var/www/html
• Static IP for VM: 192.168.3.5

Create index.php with the following contents.

<?php
    phpinfo();
?>

Now that I have accessed http://192.168.3.5 and checked phpinfo, I can use PHP.

You can also connect to mysql from a virtual terminal.

Problem (1)
After accessing http://localhost,

The page cannot be displayed due to the following error

•Verify that the web address http://localhost is correct.

Problem (2)

After accessing http://192.168.3.5/phpMyAdmin,

The following error prevents phpMyAdmin login screen from appearing.

Forbidden You don't have permission to access/phpMyAdmin/on this server.
Apache/2.2.15 (CentOS) Server at 192.168.3.5 Port 80

Restarting the iptables service by adding the following line to the /etc/sysconfig/iptables configuration file will not resolve the above error:

-AINPUT-m state --state NEW-m tcp-ptcp --dport80-j ACCEPT 

Could you tell me how to solve this problem?
Thank you for your cooperation.

The main settings are as follows:

(1) Change /etc/httpd/conf/httpd.conf


　
(2) /etc/httpd/conf.d/phpMyAdmin.conf New
with the following contents
(3) Change /var/www/html/phpMyAdmin/config.inc.php
$cfg['browfish_secret'] = 'hogehoge';
$cfg['Servers'][$i]['auth_type']='cookie';
$cfg['Lang'] = 'ja-utf-8';

(4) Change the owner of phpMyAdmin
chown-Root.apache/var/www/html/phpmyadmin/

(5) Configure the database in /var/www/html/define.php
define("DB_SERVER_NAME", "localhost";
define("DB_USER_NAME", "root";
define("DB_USER_PASS", "testpass";
define("DB_NAME", "testdb";