disallow bind_anon creates problem in cyrus

[JOYDEEP]

Dear list,

to secure my ldap server I have added the line "disallow bind_anon" in
slapd.conf.
I have checked by "ldapsearch" command and now my ldap doesn't allow
anonymous bind.
But I have now problem to use cyrus as it also based on LDAP authentication.
I can't log in in cyrus with Correct userid and passwd but if I disable
the "disallow bind_anon"   I can again use cyrus.

Could any one kindly sugeest me to  fix it ?

here is my /etc/imapd.conf

==============================================================
configdirectory: /var/lib/imap
partition-default: /var/spool/imap
sievedir: /var/lib/sieve
admins: cyrus
allowplaintext: yes
sasl_mech_list: LOGIN PLAIN
allowanonymouslogin: no
autocreatequota: 10000
reject8bit: no
quotawarn: 90
timeout: 30
poptimeout: 10
dracinterval: 0
drachost: localhost
sasl_pwcheck_method: saslauthd
servername:linux.kolkatainfoservices.in
lmtp_overquota_perm_failure: no
lmtp_downcase_rcpt: yes
unixhierarchysep:  yes
loginrealms:   kolkatainfoservices.in
hashimapspool: true
lmtpsocket:  /var/lib/imap/socket/lmtp
==============================