I had successfully integrated Samba 3.0.20b on a test linux Fedora Core4 workstation with my Windows 2003 active directory server.
All permission are working fine through active directory ACL.
Problem now is; I am working on a production Redhat ES3 server.
It is using Samba 3.0.14.
Somehow using the same procedures and steps for Fedora, I could not get it to work with the same Win2k3 server.
This are the steps that I did:
edit /etc/samba/smb.conf - OK
edit /etc/nsswitch.conf - OK
edit /etc/krb5.conf - OK
kinit
administrator@DOMAIN.COM - OK
net ADS join - OK
wbinfo -u / -g - FAILED
Error looking up domain users/groups
wbinfo -t - FAILED
checking the trust secret via RPC calls failed
error code was NT_STATUS_INTERNAL_ERROR
winbindd.log:
Error message was "SMB signature verification failed on incoming packet!"
I had looked everywhere for solution but no answer.

Anyone can help?