Dear all,

    I am running the openldap 2.4.11 with 4 way masters  (SID=001 to 004) configured.  (my suffix is empty in slapd.conf)

    The data can be synced initially.  I add records in 1 server and all the other 3 servers will have the new record added.  However, I found that after running for some time, one server will have corrupted contextCSN in SID=001.  

    dn:
    contextCSN:: sCttCIio0wAxNTQzMTMuMDQ1Mjk3WiMwMDAwMDAjMDAyIzAwMDAwMA==
    contextCSN: 20081107061013.853051Z#000000#001#000000
    contextCSN: 20081107073602.911356Z#000000#003#000000
    contextCSN: 20081107061028.825773Z#000000#004#000000

    The contextCSN for SID=002 in server 1 is corrupted.  So, whenever there is an update in SID=002 server, the SID=001 server will never get the update,
    however, when there is update in SID=003 or SID=004 server, the records will get updated in SID=001.

    We have a background cron job in each server running at 1 minutes interval to retrieve the records and set some user defined attributes if it meet some certain criteria.

    What's the cause to this corruption ?  Is there any way to recover the corrupted contextCSN by command or script without rebuild the data ?

    Thanks