Hi everyone, I am trying to setup a centralized authentification for both Unix (Solaris 7, 8 & 9) and NT4/2000 servers located in 4 different DMZ. I am searching for a native solution on both Unix and Windows platform. LDAP is giving me this possibility with Unix (Solaris) but for Windows I have no choice but to use a PDC. But the use of this type of technology (PDC) between DMZ is not a good idea, because the number of port to open would nullify the DMZ security. So, I am looking to create a Samba PDC in each DMZ that would connect to a centralized LDAP server. Is is possible to connect 4 Samba PDC to the same LDAP server and that all PDC serve the same usernames and password ? Maybe BDC would help in this case, but they would not be able to connect to the PDC directly because of the DMZ, that's why I was looking for PDC. Thank you Fran?ois Bousquet Counselor - Unix System Administrator Email : Francois.Bousquet@CGI.ca