samba - Oct 2005 - failed session setup with NT_STATUS_LOGON_FAILURE

Greetings, Do you guys know what normally causes this? - Google has a lot of
instances of the issue but no resolutions. I'm running FBSD 5.4 with the
latest samba.

Here's the command and the associated error:

insomniac# cupsaddsmb -U root -a -v
Password for root required to access 10.0.0.1 via SAMBA: 
Running command: rpcclient 10.0.0.1 -N -U'root%password' -c
'setdriver HPPRINTER HPPRINTER'
Connecting to host=10.0.0.1
Connecting to 10.0.0.1 at port 445
Doing spnego session setup (blob length=58)
got OID=1 3 6 1 4 1 311 2 2 10
got principal=NONE
Got challenge flags:
Got NTLMSSP neg_flags=0x60890215
NTLMSSP: Set final flags:
Got NTLMSSP neg_flags=0x60080215
NTLMSSP Sign/Seal - Initialising with flags:
Got NTLMSSP neg_flags=0x60080215
SPNEGO login failed: Logon failure
failed session setup with NT_STATUS_LOGON_FAILURE
Cannot connect to server.  Error was NT_STATUS_LOGON_FAILURE

Password for root required to access 10.0.0.1 via SAMBA: 

insomniac#

Any help would be appreciated.

Greetings, Do you guys know what normally causes this? - Google has a lot of
instances of the issue but no resolutions. I'm running FBSD 5.4 with the
latest samba.

Here's the command and the associated error:

insomniac# cupsaddsmb -U root -a -v
Password for root required to access 10.0.0.1 via SAMBA: 
Running command: rpcclient 10.0.0.1 -N -U'root%password' -c
'setdriver HPPRINTER HPPRINTER'
Connecting to host=10.0.0.1
Connecting to 10.0.0.1 at port 445
Doing spnego session setup (blob length=58)
got OID=1 3 6 1 4 1 311 2 2 10
got principal=NONE
Got challenge flags:
Got NTLMSSP neg_flags=0x60890215
NTLMSSP: Set final flags:
Got NTLMSSP neg_flags=0x60080215
NTLMSSP Sign/Seal - Initialising with flags:
Got NTLMSSP neg_flags=0x60080215
SPNEGO login failed: Logon failure
failed session setup with NT_STATUS_LOGON_FAILURE
Cannot connect to server.  Error was NT_STATUS_LOGON_FAILURE

Password for root required to access 10.0.0.1 via SAMBA: 

insomniac#

Any help would be appreciated.