magento enterprise install:重定向到错误的安装路径

I have imported locally a magento enterprise project , created a virtual host for it.

On my navigator,

  mydomain.com

makes an automatic redirection to

    http://www.mydomain.com/index.php/install/

giving a

   unknown adress error

Is this redirection a normal behaviour?

what could be wrong?

the server nginx ( ubuntu / nginx / php5-fpm ) log gives no error

Just a guess but try to check your database whether all tables are imported correctly. Also check your app/etc/local.xml file where database connection credentials are placed into