ldapsearch -x -Z  -H  ldap://<IP>:389 -D "AD Admin DN"  -W -b "users/admin Search context"

Examples:

ldapsearch -x -Z  -H  ldap://xxx.xxx.xxx.xxx:389  -D "CN=Administrator, cn=Users, dc=xyz,dc=com"  -W -b " cn=Users, dc=xyz,dc=com"

or if you have configured certificate as mentioned previously attached document and AD is running in SSL mode you can try,

ldapsearch -x -Z  -H  ldaps://xxx.xxx.xxx.xxx:636  -D "CN=Administrator, cn=Users, dc=xyz,dc=com"  -W -b " cn=Users, dc=xyz,dc=com"

Thank you again.  I finally got the ldapsearch command to run per your examples.  I do get the following error before it asks for the LDAP password: ldap_start_tls: Server is unavailable (52), but the command does run.  I limited the search to just the ifolderadmin account I'm trying to use.  I've attached the results.  In your next step you ask me to check for multiple users with the same login attribute value.  Before I enabled LDAP I was able to get into the administrative web interface and I created a user (gknue) and used this as a test account.  I was able to login into the user web interface and also connect a windows xp client.  Could this account be causing me problems?  If so, I'm not sure how to get rid of it since I can't get into the admin interface.  I did change the INFO string to DEBUG in Simias.log4net file and restarted apache but I don't see any erros in the simias.log except when I try to login as gknue and then I get the following error:

2009-10-09 17:57:23,245 [-1444026032] ERROR Simias.ADLdapProvider.User - LdapError:80090308: LdapErr: DSID-0C0903AA, comment: AcceptSecurityContext error, data 525, v1771
2009-10-09 17:57:23,245 [-1444026032] ERROR Simias.ADLdapProvider.User - Error:Invalid Credentials
2009-10-09 17:57:23,245 [-1444026032] ERROR Simias.ADLdapProvider.User - DN:gknue  

I'm sorry to be so ignorant on this but your help is greatly appreciated.