cyradm and web-cyradm can't login

[alesysadmin at alice.it]

Hi,
i would like to propose i linux mail server to my firm.
So i followed the instruction found at:
http://www.delouw.ch/linux/Postfix-Cyrus-Web-cyradm-HOWTO-it/html/t1.html

All ports http, pop3 and imap are listening.
All services start whithout error.

The problem is that i can't login either using cyradm or web-cyradm.

By cyradm:

cyradm -u cyrus –server localhost –auth plain.

nothing appens, i don't see password prompt.

my /var/log/auth.log

Aug  4 22:18:01 debian perl: unable to dlopen /usr/local/lib/sasl2/libsasldb.so.2: libdb-4.4.so: cannot open shared object file: No such file or directory

By web-cyradm:

I write username admin
password test

/var/log/web-cyradm-login.log

but it returns to the login page.

Please excuse my bad English, but i'm italian and i have studied it 10 years ago.
Thanks in advance.
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