[exim] Authenticator failed for external connected thru mail…

Hi,

This failed with the error message:
2004-11-06 15:33:25 sasl_cram_md5 authenticator failed for
([192.168.9.1]) [192.168.9.1]: 535 Incorrect authentication data
2004-11-06 15:33:25 sasl_plain authenticator failed for ([192.168.9.1])
[192.168.9.1]: 535 Incorrect authentication data

192.168.9.1 is configured as not a relay host of the mail server.

The cyrus(2.2)-imap (with sasl2.2) configuration is as follow:
admins: cyrus
allowanonymouslogin: no
allowplainwithouttls: yes
allowplaintext: no
altnamespace: no
autocreatequota: 10000
configdirectory: /var/db/imap
drachost: localhost
dracinterval: 0
duplicatesuppression: yes
lmtp_overquota_perm_failure: no
#lmtpsocket: /var/spool/postfix/public/lmtp
lmtpsocket: /var/spool/imap/public/lmtp
normalizeuid: yes
partition-default: /var/spool/imap
poptimeout: 10
quotawarn: 90
reject8bit: no
sasl_mech_list: plain login NTLM cram-md5 digest-md5
#sasl_pwcheck_method: saslauthd
sasl_pwcheck_method: auxprop
sievedir: /var/imap/sieve
timeout: 30

Authenticator of Exim is configured as follow:
.....
sasl_cram_md5:
        driver = cyrus_sasl
        public_name = CRAM-MD5
        server_set_id = $1

sasl_plain:
        driver = cyrus_sasl
        public_name = PLAIN
        server_set_id = $1

Exim is compiled with cyrus-sasl2.2 support.

I've been working on this issue for more than a month.
Any suggestion is highly appreciated.

Thanks
Sam