MySQL is not working on PHP with Fedora 16

[Fedora Linux]

Hello

I have a web application but it is not working on my Fedora 16 with PHP,
for some reason it is unable to connect to the MySQL server, it returns the
error:

[Sun Jan 22 08:40:24 2012] [error] [client ::1] PHP Warning:
 mysql_connect(): Can't connect to local MySQL server through socket
'/var/lib/mysql/mysql.sock' (13) in /var/www/html/install2.php on line 22,
referer: http://localhost/install.php

Notice that the user/password is correct, the PHP is installed and working
and MySQL is up and running...

Even the socket is there

# ls -l /var/lib/mysql/mysql.sock
srwxrwxrwx. 1 mysql mysql 0 Jan 22 08:37 /var/lib/mysql/mysql.sock

What can be the problem? The application is okay, I am using it in a
production server and it is running in 2 other local computers (with
slackware) for testing purposes...

This is the first time that I can't connect to MySQL via PHP... I don't
know if it requires an extra configuration or there is a missing package
that I should install... the httpd log does not give more details...

Thanks for any help!
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