Garacesh on "Updated MySQL, 500 Internal Server Error"

@javawpscript No, it's hosted on a Windows Server 2012 R2 virtual machine.

@catacaustic thanks for that.

Warning: mysql_connect(): No connection could be made because the target machine actively refused it. in C:\inetpub\wwwroot\wordpress\wp-includes\wp-db.php on line 1416

1415 if ( WP_DEBUG ) {
1416 $this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
1417 } else {
1418 $this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
1419 }