Description:
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Same as bug #45150. I was not able to connect to MySQL via localhost though PHP found the mysql extension etc.
Finally, after 20 hours work, I found a website through Google that let me to a solution. To fix this I'll have to use "127.0.0.1" instead of "localhost"
I'm using IIS7.5 on Windows 7 Ultimate 64bit
FastCGI (PHP 5.2.13 installer [20,929Kb] - 25 February 2010, md5: 891e3262428851ebe71d5432a97be6d5, with my own php.ini aftertouch)
MySQL 5.1.46-winx64
Using both IPv4 and IPv6
I can use localhost within MySQL command prompt, but not with PHP.

Test script:
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// timeout
$host = "localhost";
$user = "root";
$password = "******";
$database = "******";
$mysql_link = mysql_connect( $host, $user, $password );

// timeout fixed
$host = "127.0.0.1";
$user = "root";
$password = "******";
$database = "******";
$mysql_link = mysql_connect( $host, $user, $password );


Expected result:
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Normal connection with mysql without timeout.

Actual result:
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Timeout trying to connect via mysql_connect (Error: 2002)