OK... I solved it. It is because I have not configured the httpd.conf to allow the centos listen port 80 and 8080.

Listen 80
Listen 8080

I have setup the myphpadmin on my CentOS 6.4 recently. I can access and login to the myphpadmin on my localhost. However, when I type http://[hostipaddr]/phpmyadmin on my other computer in the same LAN with the CentOS, the browser simply cannot access the page. Below are some of the current configuration. Anyone can help please......?

config.inc.php

$i++;
/* Authentication type */
$cfg['Servers'][$i]['auth_type'] = 'http';
/* Server parameters */
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['compress'] = false;
/* Select mysql if your server does not have mysqli */
$cfg['Servers'][$i]['extension'] = 'mysql';
$cfg['Servers'][$i]['AllowNoPassword'] = false;

phpmyadmin.conf

<Directory /var/www/html/phpmyadmin/>
order allow,deny
allow from all
</Directory>

Furthermore, I can access the webpage that stored in the CentOS from my other computer without problems. After using wireshark and tcpdump, I found that the server (the Cent OS) keep resetting the connection. (192.168.1.106 is my other computer, 192.168.1.101 is my CentOS)

23:29:42.281473 IP 192.168.1.106.55999 > 192.168.1.101.webcache: Flags [S], seq    2559409090, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
23:29:42.281504 IP 192.168.1.101.webcache > 192.168.1.106.55999: Flags [R.], seq 0, ack 2559409091, win 0, length 0

I have disabled the iptables service on the CentOS already.