[Dovecot] How to port this dovecot-1.x configuration file to dovecot-2.x

[forumer]

Hi,

I am trying to move from dovecot-1.x to dovecot 2.1 but I have this 
error :

Sep 23 16:04:13 lda: Error: userdb lookup: 
connect(/var/run/dovecot/auth-master) failed:
Permission denied (euid=5000(vmail) egid=5000(vmail) missing +r perm: 
/var/run/dovecot/auth-master, dir owned by 0:0 mode=0755)

and I dont' manage to find information about how to translate this old 
configuration part:

socket listen {
    master {
      # Master socket provides access to userdb information. It's 
typically
      # used to give Dovecot's local delivery agent access to userdb so 
it
      # can find mailbox locations.
      path = /var/run/dovecot/auth-master
      mode = 0600
      # Default user/group is the one who started dovecot-auth (root)
      user = vmail
      #group =
    }
    client {
      # The client socket is generally safe to export to everyone. 
Typical use
      # is to export it to your SMTP server so it can do SMTP AUTH 
lookups
      # using it.
      path = /var/run/dovecot/auth-client
      mode = 0660
    }




Thanks