greate, thanks for your hard work. I tried to follow the instruction and got
the following error:
ERROR 2005-07-29 07:02:13,124 StandardWrapperValve:invoke -
Servlet.service() for servlet default threw exception
org.acegisecurity.ldap.LdapDataAccessException: Unable to connect to LDAP
server; nested exception is javax.naming.CommunicationException: Request: 1
cancelled
javax.naming.CommunicationException: Request: 1 cancelled
        at com.sun.jndi.ldap.LdapRequest.getReplyBer(LdapRequest.java:77)
        at com.sun.jndi.ldap.Connection.readReply(Connection.java:435)
        at com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:357)


Can you give me some suggestion how it happended? 

Thanks!

here is my related config:

     <bean id="ldapAuthProvider"
          
class="org.acegisecurity.providers.ldap.LdapAuthenticationProvider">
      <constructor-arg>
        <bean
class="org.acegisecurity.providers.ldap.authenticator.BindAuthenticator" >
           <constructor-arg>
                <ref local="initialDirContextFactory"/>
         </constructor-arg>
           <property name="userDnPatterns">
                <list>
                        <value>uid={0},ou=people </value></list>
           </property>
        </bean>
      </constructor-arg>
      <constructor-arg>
        <bean
class="org.acegisecurity.providers.ldap.populator.DefaultLdapAuthoritiesPopulator">
           <constructor-arg><ref
local="initialDirContextFactory"/></constructor-arg>
           <constructor-arg><value>ou=groups</value></constructor-arg>
           <property name="groupRoleAttribute"><value>ou</value></property>
        </bean>
      </constructor-arg>
    </bean>

<bean id="initialDirContextFactory" 
class="org.acegisecurity.ldap.DefaultInitialDirContextFactory">
      <constructor-arg
value="ldap://ldap.xxx.umich.edu:xxx/dc=xxx,dc=umich,dc=edu"/>
</bean>


    <bean id="authenticationManager"
class="org.acegisecurity.providers.ProviderManager">
        <property name="providers">
            <list>
                <ref local="ldapAuthProvider"/>
                <ref local="daoAuthenticationProvider"/>
                <ref local="anonymousAuthenticationProvider"/>
                <!-- rememberMeAuthenticationProvider added programmatically
-->
            </list>
        </property>
    </bean>

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