Would anyone have an idea how to join a linux machine (ubuntu 9.04) to a domain in samba? Have been able to join windows XP machines to the domain but am having trouble joining a linux client machine. when i do
"net rpc join -U root%xxxxxx"
it shows i have successfully joined the domain even when i test the connection

root@openit-9:~# net rpc testjoin
Join to 'DOMAIN' is OK

but when i try to log in, am not able.
Am using CentOS 5.3, zimbra 5.0.21 and samba 3.0.33

Have setup the clent machine like this:-

workgroup = domain
security = domain
password server =
passdb backend = ldapsam:ldap://
encrypt passwords = yes

Dont know where am going wrong.