Hi Meha,We have faced the similar kind of issue. We are using TS6.1 with iplanet LDAP server. This problem would have been arised becqause of below cases.1) LDAP client binding fails between LDAP server and CMS server.2) LDAP admin password would have been expired.3) LDAP schema would have been corrupted.4) CMS entity DB would have been corrupted.5) IF you have configured your LDAP as MAster-slave configuration, then the issue may because of consumer LDAP.On top of the above cases, an hint can be obtained from IW logs as well as error log files for slapd process.Please let us know on the progress.