samba - May 2013 - Why am i getting "Transport endpoint is not connected"

Hi,

I got no replies to my last post "win 7 client can't map drive:
getpeername
failed"

Anyway I've dug a little deeper on the server side by setting log level 10
and found
the error:
  "Transport endpoint is not connected"

Basically I compared the logs (several thousand lines!) from two windows 7
clients,
one of which always works (the good client) and one which always fails (the
bad client)

On each client I ran
  net view \\saturn

The logs are virtually identical up to the bad client error

The only differences are:
  the bad client requests two additional protocols: [SMB 2.002] and [SMB
2.???].

But then both client log files say "Selected protocol NT LM 0.12"
anyway

Both clients call
  set_remote_arch: Client arch is 'Win2K'
at the same point in the logs

But later on the good client calls
  set_remote_arch: Client arch is 'Vista'
This does happen on the bad client but much later in the logs

Thats it, everything else is idetical up until the error!

On the good client we continue with
  read_smb_length_return_keepalive
but on the bad client we see a
  read_fd_with_timeout


Bad Client
----------
[2013/05/10 12:35:54.185760,  3] smbd/reply.c:846(reply_tcon_and_X)
  tconX service=IPC$

[2013/05/10 12:35:54.186151,  0] lib/util_sock.c:474(read_fd_with_timeout)

[2013/05/10 12:35:54.186216,  0]
lib/util_sock.c:1440(get_peer_addr_internal)
  getpeername failed. Error was Transport endpoint is not connected
  read_fd_with_timeout: client 0.0.0.0 read error = Connection reset by
peer.

[2013/05/10 12:35:54.186259, 10] smbd/process.c:291(receive_smb_raw_talloc)
  receive_smb_raw: NT_STATUS_CONNECTION_RESET



Good Client
-----------
[2013/05/10 12:35:43.755239,  3] smbd/reply.c:846(reply_tcon_and_X)
  tconX service=IPC$

[2013/05/10 12:35:43.755642, 10]
lib/util_sock.c:730(read_smb_length_return_keepalive)
  got smb length of 100


Does anyone have any ideas how I can resolve this or thoughts on how to
investigate further?

Does the NT_STATUS_CONNECTION_RESET
 mean the bad client is disconnecting ? But why ?


Please guys you are my last hope of getting to the bottom of this :(

Thanks
Ed