no sasl authentication mechanisms

[Cercetasu]

hello

i've just installed ispcp omega rc4 on fedora 8.
i can't get smtp authentication to work.
postfix is started, saslauthd is started.
when i try to connect to the server with a mail client or by telnet i get disconnected and this error apears in the log:


May 9 22:08:57 ns2 postfix/smtpd[26105]: warning: xsasl_cyrus_server_get_mechanism_list: no applicable SASL mechanisms
May 9 19:08:57 ns2 postfix/smtpd[26105]: fatal: no SASL authentication mechanisms
May 9 22:08:58 ns2 postfix/master[25557]: warning: process /usr/libexec/postfix/smtpd pid 26105 exit status 1
May 9 22:08:58 ns2 postfix/master[25557]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling

May 9 22:28:03 ns2 postfix/smtp[26282]: fatal: unknown service: smtp/tcp
May 9 22:28:04 ns2 postfix/qmgr[25560]: warning: private/smtp socket: malformed response
May 9 22:28:04 ns2 postfix/qmgr[25560]: warning: transport smtp failure -- see a previous warning/fatal/panic logfile record for the problem description
May 9 22:28:04 ns2 postfix/master[25557]: warning: process /usr/libexec/postfix/smtp pid 26280 exit status 1
May 9 22:28:04 ns2 postfix/master[25557]: warning: /usr/libexec/postfix/smtp: bad command startup -- throttling
May 9 22:28:04 ns2 postfix/qmgr[25560]: warning: connect to transport retry: No such file or directory
May 9 22:28:04 ns2 postfix/master[25557]: warning: process /usr/libexec/postfix/smtp pid 26281 exit status 1

any ideas?