[Samba] Accessing a guest share from Windows 10 gives System error 5 on some computers
- Date: Fri, 30 Jun 2017 13:56:39 +0000
- From: Kai Ruhnau via samba <samba@xxxxxxxxxxxxxxx>
- Subject: [Samba] Accessing a guest share from Windows 10 gives System error 5 on some computers
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.
T:+49 202 769302 19
Target Systemelektronik GmbH & Co. KG
Amtsgericht Wuppertal HRA 23898
Persönlich haftende Gesellschafterin
Target Systemelektronik Beteiligungs GmbH
Heinz-Fangman-Straße 4, 42287 Wuppertal
Amtsgericht Wuppertal HRB 25346
Geschäftsführer: Jürgen Stein
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