samba - Sep 2007 - Problem with tar commands in smbclient 3.0.23c

Since upgrading from CentOS 4.3 to CentOS 5 the smbclient tar commands
seem to be broken.  The version on 4.3 was 3.0.10 I believe, while on 5
it is 3.0.23c-2. 

Here's what happens.

Running the command:
$  /usr/bin/smbclient \\\\host.domain.com\\backup -A /tmp/ntcredentials
works fine.  It connects no problem.

But:
$  /usr/bin/smbclient \\\\host.domain.com\\backup -A /tmp/ntcredentials
-Tc /tmp/blah.tar
fails with the following error
session setup failed: NT_STATUS_LOGON_FAILURE

The debug output looks like this

[name@host tmp]$ /usr/bin/smbclient \\\\host.domain.com\\backup -d 3 -A
/tmp/ntcredentials -Tc /tmp/blah.tar
lp_load: refreshing parameters
Initialising global parameters
params.c:pm_process() - Processing configuration file
"/etc/samba/smb.conf"
Processing section "[global]"
added interface ip=192.168.222.2 bcast=192.168.222.255 nmask=255.255.255.0
Client started (version 3.0.23c-2).
resolve_lmhosts: Attempting lmhosts lookup for name host.domain.com<0x20>
resolve_wins: Attempting wins lookup for name host.domain.com<0x20>
resolve_wins: WINS server resolution selected and no WINS servers listed.
resolve_hosts: Attempting host lookup for name host.domain.com<0x20>
Connecting to 192.168.222.40 at port 445
Doing spnego session setup (blob length=101)
got OID=1 2 840 48018 1 2 2
got OID=1 2 840 113554 1 2 2
got OID=1 2 840 113554 1 2 2 3
got OID=1 3 6 1 4 1 311 2 2 10
got principal=ts$@DOMAIN
Got challenge flags:
Got NTLMSSP neg_flags=0x62890215
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
session setup failed: NT_STATUS_LOGON_FAILURE

This is is breaking out backups, which worked fine on the older version
of smbclient without any special trickery.  Any help, anyone?

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