[Samba] SMB Signature verification failed on incoming packet

[Fran Fabrizio]

My setup is Samba/smbclient version 3.0.1 on linux RedHat 9. 
\\snapper\dfs is a dfs share on snapper, a Win2k3 Active Directory
server.  My smb.conf contains:

[global]
realm = ciswinnet.cis.uab.edu
workgroup=CISWINNET
security = ADS
encrypt passwords = yes
password server = snapper.cis.uab.edu
client use spnego = yes

I am trying to run the following command:

smbclient \\\\snapper\\dfs <mypassword> -U Administrator -E -W CISWINNET
-D home -d0 -Tqca /tmp/junk.tar &

This command starts tarring up the contents of \\snapper\dfs\home until
a very predictable point, when it fails with the error "SMB Signature
verification failed on incoming packet!"

I start the command, and it happily runs for about 3 minutes and then...

[2004/01/13 17:39:21, 0] libsmb/clientgen.c:cli_receive_smb(121)
  SMB Signature verification failed on incoming packet!
[2004/01/13 17:39:21, 0] client/clitar.c:do_atar(698)
  Error reading file
\home\faculty\bryant\bryantback-brblt\Images\backups\backup20011126.zip
: Server packet had invalid SMB signature!
[2004/01/13 17:39:21, 0] client/clitar.c:do_atar(733)
  Didn't get entire file. size=50316714, nread=46322640
[2004/01/13 17:39:21, 0] client/clitar.c:do_atar(654)
  Server packet had invalid SMB signature! opening remote file
\home\faculty\bryant\bryantback-brblt\Images\backups\b
(\home\faculty\bryant\bryantback-brblt\Images\backups\)
[2004/01/13 17:39:21, 0] client/clitar.c:do_atar(654)
  Server packet had invalid SMB signature! opening remote file
\home\faculty\bryant\bryantback-brblt\Images\backups\b
(\home\faculty\bryant\bryantback-brblt\Images\backups\)
Server packet had invalid SMB signature! listing
\home\faculty\bryant\bryantback-brblt\Images\c\*
Server packet had invalid SMB signature! listing
\home\faculty\bryant\bryantback-brblt\Images\f\*
...and so on for the rest of the \\snapper\dfs\home directory

It always happens with the file
\home\faculty\bryant\bryantback-brblt\Images\backups\backup20011126.zip
and then continues to fail out for the rest of the files in the
directory. 

I'm don't think Kerberos is coming into play here since I'm providing my
authentication on the command line, but that's just a guess.  Any
pointers as to what's going wrong here? 

The end goal is to backup our dfs share via the Amanda backup software,
and this command that I am running is exactly the one that Amanda is
trying to run, and seeing the errors that I've outlined here.

Thanks,
Fran

-- 

Fran Fabrizio
Senior Systems Analyst
Department of Computer and Information Sciences
University of Alabama - Birmingham
fran at cis.uab.edu
(205) 934-0653