Hello! I have three problems that i can't quite solve.

Firstly:
I have set up a simple Samba (latest version, no LDAP backend) PDC on Ubuntu 8.10 Desktop and i have a Windows XP client on the domain. The thing is when i change the password for that account on samba ("smbpasswd -a username") the XP client doesn't see the new password and keeps logging in with the old password. All works well when i change the password directly on the Windows XP client.

Secondly:
I have my smb.conf file set up to map a network drive ("H:") everytime the client (XP) starts. It works the first time the user logs in after joining the domain, after that no more and when i try to access the other shares the server requires authentication giving me a popup window to fill in my username and password.

Thirdly:
Do i have to create ubuntu system passwords for every user on samba? I currently have two users on samba that are the same as the system root and myself.

Could anyone help solve these issues?! Thanks in advance.

Edit: What I wanted to say was: "Do i have to create ubuntu system accounts ..."

P.S. Thank you so much for you response cheftec.

I'm no expert, but since no one has answered your question yet, i'll work from experience:

Firstly: First, make sure the password is actually being created. If it is, then: Yes, all works well when you change the passwd on the XP client. I dont' know why. More than likely you have to tell the XP client to look for the new password, but I don't know how to do that. Ask Microsoft. If it's not, make sure you're root (I know, but, still) and check man smbpasswd for details, you might have to manually edit something, and i'm not sure where that is on ubuntu. (/etc/smbpasswd, etc/users...)

Secondly: Pretty sure that is a XP issue as well. Doesn't make any sense that any value you could put in would affect it like that. have you tried accessing the server after the first time with other users?
But anyway, here's a maintained smb thread, sure with mandriva, but lower info still applies:

http://www.swerdna.net.au/linhowtosambacifs.html

Thirdly: What? Yes, you have to create samba passwds for any person that wants to access your samba share.