[Samba] Little trouble with samba authentication in domain windows AD

[ARPAV\atomelleri in locale]

Hi,

I'm not sure if this issue is due to a samba behaviour, but I try to
post this question...

I've joined my (virtualbox) ubuntu in my AD windows domain, following
Ubuntu instruction . So it seem almost everithing is ok, my login
authentication seem doing fine, I perform it with 'MYDOMAIN\myuser"
without problem.

When I browsing my network and clikking on my server share (please note
it is a linux samba server) it show me a prompt asking me a password ?!?
Here the question... 

I think, I am just authenticated in domain ! ...why am I prompted to
insert password again ?!? (Please note, of course if I insert password I
get my share without problem... but I think I must not need do it too
isn't it ?)


The command 'klist' give me this output:
----
Default principal: myuser at MYDOMAIN

Valid starting Expires Service principal
08/20/09 10:58:20 08/20/09 20:58:20 krbtgt/MYDOMAIN at MYDOMAIN
renew until 08/27/09 10:58:20
08/20/09 10:58:20 08/20/09 20:58:20 UBUDESK$@MYDOMAIN
renew until 08/27/09 10:58:20


Kerberos 4 ticket cache: /tmp/tkt0
----

so I think I'm just granted... isn't it ?!?


thx in advance