Domain security and long user names

[sburleson]

I am using SAMBA 2.2.1 on a SCO Openserver 5.0.7 Box to broadcast shares on the network. I have successfully joined the server to an existing domain, i.e. Samba is not the PDC and I do not want it to be. Authentication is working fine when the user name is eight characters or less, but I cannot get users authenticated that are larger. I have tried setting up the username map option, but this does not seem to work. Does anyone have any ideas? Here are important areas of my smb.conf. The first share is intended to be accessible by everyone but read only. The second share is intended to be fully accessible by a select few. If someone has a user name > 8, though, they cannot access either.

[global]
workgroup = CHH
wins server = 172.18.192.7
name resolve order = wins lmhosts hosts bcast
security = domain
encrypt passwords = yes
password server = clio
kernel oplocks = no
local master = no
dns proxy = no
add user script = /etc/useradd -s /bin/false %u
username map = /usr/local/samba/lib/usermap

[sambaprd]
path = /u/sambashr
browseable = yes
read only = yes
fake oplocks = yes
guest ok = yes
default case = lower
preserve case = no
guest account = fve

[patxfer]
path = /u3/patxfer
browseable = yes
read only = no
default case = lower
preserve case = yes
locking = no
valid users = dmullins jhill jameek vkelly ddunn platka rthompson smadden