How to eliminate Repeated Samba Errors

We are using windows 2000 servers and accessing shared volumes on
fedora 4 via samba. Can anyone inform me why these errors keep getting
generated as seen in windows events viewer?

Included are the two intermittent errors and samba config file content

Error messages on the Windows servers:

(87) The parameter is incorrect.
or
(1326) Logon failure: unknown user name or bad password.

smb.conf file:

#======================= Global Settings
=====================================

[global]



workgroup = WORKGROUP

server string = Server

log level = 0

log file = /var/log/samba/log.%m

max log size = 50

security = user

encrypt passwords = yes

smb passwd file = /etc/samba/smbpasswd



socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192

local master = no



dns proxy = no

syslog only = yes

#============================ Share Definitions
==============================



[sharea$]

path = /a

writeable = no

write list = @group

create mask = 775

[shareb$]

path = /b

writeable = no

write list = @group

create mask = 775

[sharec$]

path = /c

writeable = no

write list= @group

create mask = 775