[sqwebmail] ldap authentication problem

[dipak]

i have installed sqwebmail with ldap authentication. but when i try to 
login i get an error message given below.

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/var/log/messages
"Oc5:07:26:07:40 mailauthdaemond.ldap: ldap_simple_bind_s failed: Protocol 
error "

ldap.log

"requested protocol version not allowed" .

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what is wrong with my configuration ? pls suggest.

regards
dipak