Just posting an experience I had last weekend upgrading a Samba server (member server of NT4 domain) from 2.2.5 to 2.2.8... I noticed that the "join domain" command doesn't seem to work anymore using the IP address of the PDC. I used to use the following command: #smbpasswd -j <DOMAIN> -r <PDC-IP> -U <Domain Admin Username> With 2.2.8 it wouldn't work until I used this: #smbpasswd -j <DOMAIN> -r <PDC-NETBIOS-NAME> -U <Domain Admin Username> Also, I added "-D 4" to the end, which gives a nice smattering of debug info. Great stuff if you're having trouble joining a domain.