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

[Andrei Mikhailovsky]

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