Issue

Our RHEL6 servers are configured to use LDAP authentication against our LDAP server.The problem we have is that every hour (exactly on the hour) the systems run a query to receive information on every LDAP user available which is causing excessive load on the LDAP server.
The LDAP server sees the following requests from the server

base=cn=Users,dc=example,dc=com scope=2 filter=(&(objectClass=posixAccount)(uidNumber=*)(HomeDirectory=*)(isdomainuser=yes))

whereas the standard user queries (during a login) would appear as follows

base=cn=Users,dc=example,dc=comscope=2 filter=(&(&(objectClass=posixAccount)(uidNumber=*)(HomeDirectory=*)(isdomainuser=yes))(uidNumber=12345))

We would like to identify what is causing this hourly update so that we may stop it and reduce the load on the LDAP server