error net rpc addmem

[Kurt De Kesel]

Hi,

I received this error when add  a member to the Backup Operators group
The following setup is used:

# ./net groupmap list
Backup Operators (S-1-5-21-736258160-3382879245-470844908-551) -> backop

backop is a local unix group

# ./net rpc group list
Password:
Backup Operators

# ./net rpc group addmem "Backup Operators" adminbbs
Password:
Could not add adminbbs to Backup Operators: NT_STATUS_NO_SUCH_ALIAS

adminbbs is not a local Unix group but can be look up with nis

# ypcat passwd | grep adminbbs
adminbbs::898:500:adminbbs:/personal/adminbbs:/bin/csh

samba server is joined with an active directory domain
smbd, nmbd services are running, no winbindd daemon is activated. 

Any idea what could be wrong?

thanks for your input