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

I get these repeated errors from my windows server but cannot understand why.
I am running samba on fedora 4 boxes and my servers run on windows 2000.
Whenever someone attempts to manually access a shared volume on a linux box and use the right credentials we never experience the 1326 error.
I included the samba config file below and more details of both errors from event viewer.
Does anyone have a clue why both errors occur like dozens of times daily?

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

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

>Does anyone have a clue why both errors occur like dozens of times daily?

When you ask a question like that it might imply that it actually works sometimes - is this the case (that it sometimes works from windows boxes), or not (that it never works from windows boxes)?

BTW, has this config ever worked?  If so, what changed between then and now?

What do your log files on the samba server show when this error is generated?

This sounds like an authentication problem - what happens if you apply the plain-text samba registry patch for windows?

Cheers,
-Jon