I have a clean installation of the latest stable ISPConfig on Debian 6. As I see, there is no sys_user table, because the system users are stored in 'client' table. But the table is empty, and I can not login as admin. What should I do?
There must be a sys_user table. ISPConfig users are stored in that table. If that table is missing, you cannot log in. I guess something went wrong with your installation.
Did you use this guide to set up the system? http://www.howtoforge.com/perfect-server-debian-squeeze-with-bind-and-courier-ispconfig-3
No, but I used similar way - I already have all the needed components installed (and MariaDB instead of MySQL, but there are fully compatible).