[Samba] Samba PDC - Usernames with over 20 characters are not working with Vista SP1

Andrei Mikhailovsky mlists at arhont.com
Tue Oct 14 17:07:25 GMT 2008

Bruno, thanks for the reply.

Having read through the section i have found the information on the
group name limitations, which are mostly related to Unix like system.
>From there, windows 200x systems support group names of 254 characters.
It doesn't actually say anything about username limitations.

I have no problem using long usernames in Samba + Linux client - all
works fine and I am able to login.

However, the problem is with Samba + Windows Vista SP1 and usernames
longer then 20 characters. On the other hand, Samba + Windows Vista
(without SP1 installed) works fine.

However, this problem does not happen with Microsoft 2003 AD + Vista
SP1. Therefore, the combination of Samba + Vista SP1 seems to result in
problems with logons using long usernames. I am using Samba 3.2.3 and
the same problem happens on Samba 3.0.28 and 3.0.31.

Any thoughts on this would be appreciated.


Bruno La Torre wrote the following on 14/10/08 17:28:
> see : http://www.hep.phy.cam.ac.uk/samba-3.0.9/Samba-Guide/migration.html
> section: What are the limits or constraints that apply to group names
> Andrei Mikhailovsky ha scritto:
>> Hi all,
>> I am having difficulties logging into Samba domain with Vista SP1 with
>> usernames that have over 20 characters in their names. Vista SP1 gives
>> me the following error:
>> The local Session Manager service failed the logon.
>> The data area passed to a system call is too small.
>> Anyone know what might be the cause of the problem and how to solve it?
>> Many thanks

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