Rails - Oct 2007 - LDAP bind error

i am new to rails .....

in java  ldap server is connecting without problem
--------------------------------------------
 username=""
 password=""
 LDAPConnection ld = new LDAPConnection();
 ld.connect( "192.168.1.1", 389);
 con=ld.authenticate (
"uid="+username+",ou=People,dc=srishtisoft,dc=com",password);

/// con--->true



but in rails
-----------------------------------
      ldap_con = Net::LDAP.new({:host => ''192.168.1.1'',
                                :port => 389,
                                :auth=>
                                   {
                                    :method=>:simple,
                                    :username => username,
                                    :password => password
                                   }
                                })
     @con=ldap_con.bind

#@con  --->false  (always )

what is wrong here
any help please.....
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