problem with pam_smb!

[±ißN·¬]

       I've used pam_smb on my old Red Hat Linux 6.0 server and it works
fine.
      Yesterday,I upgrade my server using Mandrake 7.1. Of course,I install
pam_smb for login via my PDC.
      But, It doesn't work! both ftp and telnet login,down below is my
/var/log/auth.log

Aug 24 10:23:38 www ftpd[24944]: pam_smb: Local UNIX username/password check
incorrect.
Aug 24 10:23:38 www ftpd[24944]: pam_smb: Configuration Data, Primary BDC1,
Backup BDC1, Domain TCES.
Aug 24 10:37:28 www in.telnetd[25517]: connect from 127.0.0.1
Aug 24 10:37:32 www login: pam_smb: Local UNIX username/password check
incorrect.
Aug 24 10:37:32 www login: pam_smb: Configuration Data, Primary BDC1, Backup
BDC1, Domain TCES.
Aug 24 10:37:36 www login: pam_smb: Local UNIX username/password check
incorrect.
Aug 24 10:37:36 www login: pam_smb: Configuration Data, Primary BDC1, Backup
BDC1, Domain TCES.


    it's seems that pam_smb found passwd error then connect to BDC1 but it
doesn't get any returned passwd or not connect successful,
    then the ftpd and telnetd timeout.
    How to solve this problem?
     Another question,what is the differenct between pam_smb & pam_ntdorm ?
I counldn't compile pam_ntdorm...