Thanks!! Robert Levas I performed ldaps url testing. I have issue with ldaps connection on Linux. can you help me? In RHEL > ldapsearch is working with ldap (adserver : 3268) > It is not working for ldaps (adserver : 636) > But the same ldaps (adserver : 636) I am able to connect through ldp.exe on windows machine > it look like my RHEL server not making connection with secured port (not sure) Error # ldapsearch -h adserver:636 -D user@domain -W -b DC=Examble,DC=com Enter LDAP Password: ldap_result: Can't contact LDAP server (-1) do you have any idea to resolve the issue? ... View more