Authentication problem with sevrer 2003 joined memeber

I am working on a Windows server 2003 domain member in Samba 3.28a. My samba server have successfully joined the domain.

wbinfo -t, -g, -u and -a user%passwd are all working well.

I even tried ntlm_auth with success, seeing the success log on the server.

But trying to access a share failed with "error NT_STATUS_NO_SUCH_USER".

Here's my smb.conf :
[global]
security = ADS
realm = {domain.local}
workgroup = {domain}
password server = {server ip}
encrypt passwords = yes
wins support = no
wins server = {server ip}
invalid users = root
# Winbind settings
idmap uid = 20001-30000
idmap gid = 20001-30000
winbind use default domain = yes

debuglevel = 5

socket options = TCP_NODELAY

load printers = no

[homes]
comment = Home Directories
valid users = %S
read only = No
browseable = No

# A shared folder for testing purposes
[SharedFolder]
path = /share
available = yes
writable = yes
force create mode = 0666
force directory mode = 0777
valid users = %S


Any idea ?
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