[Samba] Authentication problem?

[Anne Wilson]

LAN - mixed architecture - 2 x win98, 1 x winME, 1 x win2k, 3 x Mandrake Linux 
10.0.  Most samba activity is between the Mdk boxes, file-moving, etc.

Versions - Mandrake 10.0, with all updates applied, Samba 3.0.6-4.1

I had a properly working lan, with occasional problems between box1 and box2 
(Mdk boxes).  Now I have no connection between them, for file-sharing 
purposes, at all.  Box3, another Mdk box, uses box1 as print server, and has 
no problems in printing, but has the same problem as box2 for file sharing.

Scenario -
Box2 uses LinNeighborhood to attempt to connect to box1.
A mount appears in the lower window of LN.
It is not possible to browse that mount
The mount will not umount in LN or from the CLI
The only way to break the situation appears to be to reboot.

Log extract -
/var/log/samba/log.192.168.0.70
[2004/10/10 12:17:09, 1] smbd/service.c:make_connection_snum(648)
  192.168.0.70 (192.168.0.70) signed connect to service Public initially as 
user anne (uid=501, gid=100) (pid 12775)
[2004/10/10 12:17:09, 0] libsmb/smb_signing.c:srv_check_incoming_message(769)
  srv_check_incoming_message: BAD SIG: seq 4 wanted SMB signature of
[2004/10/10 12:17:09, 0] libsmb/smb_signing.c:srv_check_incoming_message(773)
  srv_check_incoming_message: BAD SIG: seq 4 got SMB signature of
[2004/10/10 12:17:09, 0] libsmb/smb_signing.c:signing_good(240)
  signing_good: BAD SIG: seq 4
[2004/10/10 12:17:09, 0] lib/util_sock.c:receive_smb(619)
  receive_smb: SMB Signature verification failed on incoming packet!
[2004/10/10 12:17:09, 1] smbd/service.c:close_cnum(837)
  192.168.0.70 (192.168.0.70) closed connection to service Public

From smb.conf -
[global]

workgroup = lydgate.net
server string = Samba Server %v
netbios name = anne-linux
name resolve order = hosts bcast wins
printcap name = cups
printing = cups
log file = /var/log/samba/log.%m
smb passwd file = /etc/samba/smbpasswd
username level = 3
encrypt passwords = yes
max log size = 50
hosts allow = 192.168.0.0/24 127.0.0.1
# unix password sync = yes
socket options = TCP_NODELAY SO_SNDBUF=8192 SO_RCVBUF=8192 
preferred master = yes
security = user
local master = yes
os level = 99
domain master = yes
server signing = Auto
<snip>

[Public]
comment = Anne-Linux Public
path = /Public
writable=yes
<snip>

I've run around in circles.  Can anyone give me hints or a troubleshooting 
scheme for this?  I've tried the obvious, like checking that ping works both 
by ip and name.

Anne
-- 
Registered Linux User No.293302
Have you visited http://twiki.mdklinuxfaq.org yet?