[cifs-protocol] [REG:110102774074009] "description" attribute in AD

Obaid Farooqi obaidf at microsoft.com
Thu Nov 11 09:36:30 MST 2010

Hi Matthias:
I will get back to you as soon as I have an answer.

Obaid Farooqi
Escalation Engineer | Microsoft

-----Original Message-----
From: Matthias Dieter Wallnöfer [mailto:mdw at samba.org] 
Sent: Thursday, November 11, 2010 2:00 AM
To: Obaid Farooqi
Cc: cifs-protocol at samba.org; MSSolve Case Email
Subject: Re: [REG:110102774074009] "description" attribute in AD

Hi Obaid,

exactly, that's true.
But why does the add operation allow it to be set multi-valued? Is there a reason? Or it's just a bug?


Obaid Farooqi wrote:
> Hi Matthias:
> We have finished our investigation on your question regarding attribute description. In a future release of MS-ADTS, the following bullet will be added at the end of section Constraints:
> “If the modify operation adds or replaces values of the description attribute on a SAM-specific object (section, and results in more than one value in the attribute, then the modification fails with attributeOrValueExists / ERROR_DS_SINGLE_VALUE_CONSTRAINT”
> Please let me know if this answers your question. If it does, I’ll consider this issue resolved.
> Obaid Farooqi
> Escalation Engineer | Microsoft
> -----Original Message-----
> From: Matthias Dieter Wallnöfer [mailto:mdw at samba.org]
> Sent: Wednesday, October 27, 2010 3:11 PM
> To: Interoperability Documentation Help
> Cc: cifs-protocol at samba.org
> Subject: "description" attribute in AD
> Hi dochelp team,
> the "description" attribute in AD seems very special. Altough defined as multi-valued in the schema it's defacto single-valued.
> That means:
> - on LDAP entry add operations you are able to set it multi-valued
> - on LDAP entry change operations you aren't - e.g. if you try to replace it multi-valued or perform a multi-valued add you get ERR_ATTRIBUTE_ALREADY_EXISTS.
> As far as I know I didn't find much in the docs about this strange behaviour and as far as I can tell it only applies to "description". It would be nice to enhance MS-ADTS regarding it and to start some investigation if it wouldn't be better to really define it as single-valued in the schema.
> Greets,
> Matthias
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