/admin/manage_users.php not found

[4tux]

Ok, sorry... I was a little bit tired last night...

The Old system was a Debian Etch System an the new System is a Debian Lenny. I made the migration like it is shown in the Howto. Last week i tryed this (but without the DNS-Change) an everything went fine. But last Night I made the Transfer of all things (there was no error) and when i logged in in the Admin-Panel, i can not see the manage_users.php-Site. I get an Error 404. I do not know why.

In /var/www/ispcp/gui/admin is a manage_users.php file and it has the excact permissions like all others and like the file on the old server.

I do not know, where the problem is...

What more Information do you need?