| Tuesday 13 October 2009 11:13:25 pm 
                                                                 Is your problem still the mysql connection ?  near line 164 on my ez420 in ezmysqldb.php it checks the connection.  eZDebug::writeError( "Connection error: Couldn't connect to database. Please try again later or inform the system administrator.\n$dbErrorText", "eZMySQLDB" );
 If not working you should have a message with an explicit error.  Did you also try debugging with xdebug step by step debugger ? Especially just above you can put breakpoints:  
 if ( $this->UsePersistentConnection == true )
        {
            $connection = mysql_pconnect( $server, $user, $password );
        }
        else
        {
            $connection = mysql_connect( $server, $user, $password, true );
        }
  As you noticed you may check if something goes wrong due to persitence or not :  ezdbinterface.php 
if ( $parameters['use_persistent_connection'] == 'enabled' )
        {
            $this->UsePersistentConnection = true;
        }
At least are you sure you're not using socket for your 4.0 and 4.1 version, and tcp for the 4.2. The database setting in your ini are the same ?    Pablo Pernothttp://www.smartview.fr
 http://www.areyouagile.com
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