[Samba] Accessing a guest share from Windows 10 gives System error 5 on some computers
kai.ruhnau at target-sg.com
Wed Jul 19 06:35:31 UTC 2017
> I have an embedded instrument running samba 4.4.5 or 4.6.2 that connect to Windows / Mac / Linux via USB RNDIS / CDC Ethernet.
> On those instrument, there's a single share that is configured for guest access without password:
> log level = 10
> workgroup = DATA
> server string = Samba Server
> log file = /var/log/samba/log.%m
> max log size = 50
> security = user
> map to guest = Bad User
> path = /var/db/instrument-data
> available = yes
> browsable = yes
> public = yes
> writable = no
> Locally on the instrument, I can run `smbclient -N -L localhost` and see that share.
> The behavior is consistent on a per-computer basis. I can either access the share on any instrument without problems on one computer, or on another computer I cannot and the symptom is a `net view <instrument-name>` returning "System error 5, Access denied".
> The computers currently run a mix of Windows 10's Anniversary Update (14393) or Creators Update (15063) and there doesn't seem to be a correlation regarding that.
> I tcpdumped both types of sessions, and these show that the Windows Client forcefully closes the TCP connection (NT_STATUS_CONNECTION_RESET) right after receiving `NTLMSSP_CHALLENGE` before a working client would send `NTLMSSP_AUTH` with a user.
> I have checked setting `AllowInsecureGuestAuth` in the geristry without any effect.
Isn't there anything I could try next?
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