RH8 samba won't let users in

when I type smbclient \\\\MYSERVER\\someuser at the prompt, it asks me to log in with the password for that user, and when I put it in, it says NT_USER_LOGIN_FAILURE eveyrtime, while at the linux terminal. When I try to access the server from my windows xp machine it shows up in the workgroup, but when i put in the user and password info it just rejects it, keeps asking for it, won't take that login information. Any help much appreciated!!
thanks, kym

oops, it is actually NT_USER_LOGON_FAILURE, not login, sorry.

Could you post your smb.conf and smbusers files please?

They should be located at /etc/samba/

Make sure the account details: username and password are the same in windows as they are on Linux. Also, ensure that they're added to the samba users and passwd files.
e.g. if you 've just created a new account replicate this in samba:
$ su newuser
$ passwd
newpassword

then

$smbpasswd
newpassword

The 2 passwords (and usernames) should be the same; for samba, linux and Windows.