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I tried to connect to a remote mysql server ( 192.168.1.197 ) from a server with IP 192.168.1.193.
My php connect:
$host = "192.168.1.197";
$user = "root";
$pass = "rootpassword";
$database = "sample1";
#$con=@mysql_connect("$host","$user","$pass") or die('Error connecting to mysql');
$con = mysql_connect("$host", "username", "password") or die(mysql_error());
$db="$database"; @mysql_select_db($db, $con);

When i run this in the web, I'm getting the (13) error. I've search the web but could not find any concrete answer.

If i type this in the command prompt:
[root@localhost include]# mysql -u root -h 192.168.1.197 -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 71
Server version: 5.0.51a Source distribution

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql>

I was able to connect..

Can someone help me on this one?

I even created a user rights for root ( both 193 & 197 )
User Host Password Global privileges Grant
root 192.168.1.193 Yes ALL PRIVILEGES Yes
root 192.168.1.197 Yes ALL PRIVILEGES Yes

解决方法1、：setsebool -P httpd_can_network_connect_db=1

解决方法2、：修改/etc/selinux/config SELINUX=enforcing 为 SELINUX=disabled