[Samba] understanding an error message

[David Bear]

I have a toshiba copy machine that is also used as a scanner.
The scanner can be set to store files to a SMB UNC. So I create a
username/password for the scanner to login with, then configured a unc path
for to store to. All was working well for a while.

Then the scanner stopped storing to the samba share. Initial analysis
seemed to indicate that the username/password was failing.

So I reset it and again, the machine started working. (NOTE, these are
changes to the toshiba MFD, not samba or samba-ad)

Again, the scanner stopped storing files to the samba server. So I look in
the samba logs and see this:

[2016/09/12 12:47:13.387013,  3]
../source3/smbd/process.c:1538(switch_message)
  switch message SMBtdis (pid 9099) conn 0x7f88d8a835e0
[2016/09/12 12:47:13.387069,  3]
../source3/smbd/server_exit.c:246(exit_server_common)
[2016/09/12 12:47:13.387080,  2] ../source3/smbd/service.c:1140(close_cnum)
  Server exit (failed to receive smb request)
  toshiba523print (ipv4:192.168.1.19:1321) closed connection to service
scans
[2016/09/12 12:47:13.387382,  1]
../source3/smbd/process.c:554(receive_smb_talloc)
  receive_smb_raw_talloc failed for client ipv4:192.168.1.19:1321 read
error = NT_STATUS_CONNECTION_RESET.
[2016/09/12 12:47:13.387679,  3]
../source3/smbd/server_exit.c:246(exit_server_common)
  Server exit (failed to receive smb request)

This looks to me like the toshiba MFD/scanner is not doing things
correctly. .. but then why is a TALLOC failing?

This is for samba 4.4.3 server. A samba AD DC is running in a separate VM.
Samba file server running in a host. Can anyone suggest what could be
happening? The toshiba MFD works for a couple of days, then stops? (works
means successfully creates files on the samba server)

-- 
David Bear
mobile: (602) 903-6476