can't log in into web interface [i've read everything]

Hello!
I'm installing ejabberd under freebsd 6.2 from ports. It goes ok.
Then i configuring.
first is set up admin account and hosts in conf:

{acl, admin, {user, "c0re", "mydomain.ru"}}.
{hosts, ["mydomain.ru"]}.

second - starting ejabberd and registring an account:

su ejabberd
ejabberdctl ejabberd@ftp register c0re mydomain.ru my_password

It's goes ok.
Next - i restarting ejabberd (just for case:) ) and tryying to access to web interface by link: http://jabber.mydomain.ru:5280/admin
Entering login "c0re@mydomain.ru" and password "my_password" - i get "Not Allowed".
What i did wrong?

A've read documentation, forums, gogole, but i still can't understand what is such things means:
1) in ejabberdctl register - host - what "host" is means? FQDN of server or what? Or it is "hostname -s" ? How should i register user?
2) in conf - hosts - what host i need to enter there? Host of server, or that thind, that will be a part of JID: c0re@mydomain.ru ?

Thanks in advance! But documentation has very poor covering this questions..
P.S.: Sorry for my bad English, i've got no practice

problem is solved. this is

problem is solved.
this is not fair!!!
in configuration USE ONLY small register latter
when i typing in prevous post
{acl, admin, {user, "c0re", "mydomain.ru"}}.
i hide my real nick, that is like VahAN,
and {acl, admin, {user, "VahAN", "mydomain.ru"}}. - is NOT working, BUT
{acl, admin, {user, "vahan", "mydomain.ru"}}. - WORKING !

i remembered, that more than 6 month ago i've already met this problem. I supprised that it is not fixed yet :/

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