samba - Aug 2008 - Vista SP1 login failed with "." in username

Hi All,

I have noticed that Windows Vista SP1 (Vista pre SP1 is fine) fails to
login to domain if the username has a "." dot symbol in the username.
The actual problem is not in the "." but in the combination of
"."
followed by other characters. For example, the failed login happens when
using "andrei.domain", but login is successful when the username is
"andrei."

The server side does not produce any suspicious log entries even in
debug mode, However windows Vista SP gives the following error:

The local Session Manager service failed to logon
The data area passed to a system call is too small

Did anyone experience similar issues? Are there any solution to fix the
behaviour, apart from changing the username and/or uninstalling SP1?

Thanks in advance for any help

Andrei