[Samba] understanding an error message

[Jeremy Allison]

On Mon, Sep 12, 2016 at 05:03:57PM -0700, David Bear via samba wrote:
> 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.

This means a TCP RST packet usually. What does a wireshark trace
show ?