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

Stefan Metzmacher metze at
Sat Feb 13 08:21:09 UTC 2016

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?

If so it could be related to Andrew's fixes here:;a=commitdiff;h=8007f1df75cfbcc44815a368f661317d8dbc0f3e;a=commitdiff;h=5ae622c076c56f7adaf8eeed0cfdaf657cb91beb

An older version is available here:;a=commitdiff;h=ef3a565a47d2dbc07208ca5239d83d367eb133b2;a=commitdiff;h=9fc9a3123101977435b90d6778c7033c5d907d99

for the discussion.

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.

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.


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