samba - Feb 2010 - Samba 3.4.5 - rights for /etc/samba/private and smbusermap

Hallo,

compiling 3.4.5 worked.
Installing it was no problem.

But now I get the message

   can't open username map /etc/samba/private/smbusermap Error Keine  
Berechtigung

The rights were

        700 for dir /etc/samba/private
        644 for file smbusermap

When I change the dir "private" to 711 no error is reported.

What are the minimal rights for directory and file?

Viele Gruesse!
Helmut