samba - Aug 2009 - tree connect failed: NT_STATUS_ACCESS_DENIED

hi:)

for an unkonow reason the users are not able to connect to samba.

samba member of domain, ads security. no changes on samba side.

if i run:

smbclient -U% -L ip
Domain=[INT] OS=[Unix] Server=[Samba 3.0.28a]
tree connect failed: NT_STATUS_ACCESS_DENIED

all the other commands are ok:

wbinfo
getent
testparm

do you have any ideea?

thank you:)

Gabi