This site can’t be reached in centos

There are several ways to short out this issue,
fist we should check the dns whether the internet is working or not
second we should check the server port whether it open or not

# netstat -ntlp | grep 80
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      1802/mysqld
tcp        0      0 127.0.0.1:80                0.0.0.0:*                   LISTEN      5391/httpd

from above example shows the server open the port 80 only for localhost, so we not able to reach the site from globally

so we need to change that apache configuration

# vi /etc/httpd/conf/httpd.conf   //find port 80

#Listen 80

Listen 127.0.0.1:80

#Listen 0.0.0.0:80

#Listen [::]:80

//simply change in to

#Listen 80

#Listen 127.0.0.1:80

Listen 0.0.0.0:80

#Listen [::]:80

# service httpd restart

Stopping httpd:                                            [  OK  ]

Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName

                                                           [  OK  ]

# netstat -ntlp | grep 80

tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      1802/mysqld

tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      5585/httpd

now the problem shorted out