Problems with admin access

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Hi all,
First thx for all dev team about that hosting panel control.

I read your how to install setup.
My server
debian etch dedicaced
hostname -f : ns1.domain.ltd

When the setup is finish it say to access with :
http://admin.ns1.domain.ltd

and it don't work
it only work with http://domain.ltd/index.php?admin=1

Now i need to create host plan for domain.ltd and after that i can't log to admin panel with domain.ltd / i just can log with server ip.

Someone know that issue ?

Thanx a lot.

French people who can help me is first thing i search. My english is not perfect ^^