Hi  guys im running simple ldap replication setup ,

ldap slave node sites  behind the firewall and port 389 is open to all

and my ldap replication works fine for most of the time , (slave node getting updated real time )  

But some times slave just stop getting  the update from the master server , But when is restart slave  ldap server replication start again , .... as fallows




Aug 21 11:59:24 ldapmirror slapd[18107]: do_syncrep2: rid=004 cookie=rid=004,sid=002,csn=20130821160107.813479Z#000000#002#000000
Aug 21 11:59:24 ldapmirror slapd[18107]: syncrepl_entry: rid=004 LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_MODIFY)
Aug 21 11:59:24 ldapmirror slapd[18107]: <= bdb_equality_candidates: (entryUUID) not indexed
Aug 21 11:59:25 ldapmirror slapd[18107]: syncrepl_entry: rid=004 be_search (0)
Aug 21 11:59:25 ldapmirror slapd[18107]: syncrepl_entry: rid=004 uid=user1,ou=staff,dc=example,dc=com
Aug 21 11:59:25 ldapmirror slapd[18107]: slap_queue_csn: queing 0xcc1060 20130821160107.813479Z#000000#002#000000
Aug 21 11:59:25 ldapmirror slapd[18107]: slap_graduate_commit_csn: removing 0xcc0a40 20130821160107.813479Z#000000#002#000000
Aug 21 11:59:25 ldapmirror slapd[18107]: syncrepl_entry: rid=004 be_modify uid=user1,ou=staff,dc=example,dc=com (0)
Aug 21 11:59:25 ldapmirror slapd[18107]: slap_queue_csn: queing 0xcc1060 20130821160107.813479Z#000000#002#000000
Aug 21 11:59:25 ldapmirror slapd[18107]: slap_graduate_commit_csn: removing 0x1a55a70 20130821160107.813479Z#000000#002#000000


Ldap slave configuration ..

syncrepl      rid=004
              provider=ldap://ldap.example.com
              bindmethod=simple
              binddn="cn=admin,ou=staff,dc=example,dc=com"
              credentials="passwd"
              searchbase="dc=example,dc=com"
              schemachecking=off
              type=refreshAndPersist
              retry="60 +"

mirrormode on




Is there any reason for such behavior , Please advice

Thank You
John