[Samba] Roaming profiles

[Ronald]

Iam trying to setup a samba PDC. Everything works just fine when I log 
in with the root account on one of my workstations. But when I logon 
with a normal user account I get the following message:

Windows cannot locate the server copy of your roaming profile and is 
attempting to log you on with your local profile. Changes to the profile 
will not be copied to the server when you logoff. Possible causes of 
this error include network problems or insufficient security rights. If 
this problem persists, contact your network administrator.  
DETAIL - The network name cannot be found.

A stripped down version of my smb.conf is like this:

[homes]
   comment = Home Directories
   path = /home/U%
   browseable = yes
   guest ok = no
   read only = no
   writable = yes
   create mask = 0775
   directory mask = 0775

[netlogon]
   comment = Network Logon Service
   path = /home/samba/netlogon
   guest ok = yes
   writable = no
   share modes = no

        [profiles]
        comment = Roaming profiles directory
        path = /home/samba/profiles/U%
        read only = No
        create mask = 0600
        directory mask = 0775

logon home = \\%L\%U\Win-profile
logon drive = h:
logon script = %U.bat
logon path = \\%L\profiles\%a\%U

What am I doing wrong? I can see that samba made a profile directory in 
de users homedir, but I think it has somethink to to with read/write 
acces...Iam using windows XP (without SP1), and a debian server.

Greetz Ronald.