Error 8418: The replication operation failed because of a schema mismatch between the servers involved

Matthieu Patou mat at
Mon Feb 15 06:57:12 UTC 2016

On 02/13/2016 12:21 AM, Stefan Metzmacher wrote:
> Hi Matthieu,
>>> Main strange in decrypted response is:
>>> attid: UNKNOWN_ENUM_VALUE (0x200F4)
>> My script showattid for a 2010 exchange schema seems to indicate that
>> it's homeMDB attribute:
>> scripts/ -s ~/workspace/samba/exchange2010/etc/smb.conf 0x200F4
>> Unknown parameter encountered: "dns recursive queries"
>> Ignoring unknown parameter "dns recursive queries"
>> 1.2.840.113556.1.2.244
>> Attid 0x200F4(131316) is attribute homeMDB
>> Can you check the definition of this attribute in the schema NC for
>> Windows and Samba DC ?
> Does this have the msDS-IntID attribute set?
cn: ms-Exch-Home-MDB
attributeID: 1.2.840.113556.1.2.244
msDS-IntId: -2096876625

> If so it could be related to Andrew's fixes here:
> in
> An older version is available here:
> in
I think it's worth a try, obviously it should be tested on some non 
critical environment to avoid any suprises !
> See
> for the discussion.
I'll have a closer look
> Checking the prefixMap attribute is good, but note that this is not a
> replicated attribute
> and the content may not have the same format on Windows vs. Samba.
Yes I agree, still despite a different representation we should insure 
that we have the same data.
> It would be interesting to see the struct drsuapi_DsGetNCChanges
> messages in the other direction too,
> where we replicate from Windows. We need to compare the
> drsuapi_DsReplicaOIDMapping_Ctr arrays.
Would be much easier if my PIDL patches were accepted at the moment 
where I was active at doing them :-)
> metze

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