Linux – Samba will not accept the credentials

debianlinuxsamba

I have a Debian computer running Samba. I access the server from another computer running Windows 7. As guest, I can list the share as read-only, force user, etc. But I can not access samba server with any credentials. I only get \\ip\storage is not accesible.

Here is my config:
* the users exist as real users
* samba runs as security = user
* I have added the user with smbpasswd -a user
* the logs don't show anything wrong
* the testparm is showing the following: 

[global]
    server string = %h server
    interfaces = 127.0.0.0/8, eth1
    bind interfaces only = Yes
    map to guest = Bad User
    obey pam restrictions = Yes
    pam password change = Yes
    passwd program = /usr/bin/passwd %u
    passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
    unix password sync = Yes
    syslog = 0
    log file = /var/log/samba/log.%m
    max log size = 1000
    dns proxy = No
    usershare allow guests = Yes
    panic action = /usr/share/samba/panic-action %d
    idmap config * : backend = tdb

[homes]
    comment = Home Directories
    valid users = %S
    read only = No
    create mask = 0700
    directory mask = 0700
    browseable = No

[printers]
    comment = All Printers
    path = /var/spool/samba
    create mask = 0700
    printable = Yes
    print ok = Yes
    browseable = No

[print$]
    comment = Printer Drivers
    path = /var/lib/samba/printers

[cdrom]
    comment = Samba server's CD-ROM
    path = /cdrom
    guest ok = Yes
    locking = No

[allusers]
    comment = Access to all users
    path = /home/samba-all-users
    valid users = @sambashare
    force group = sambashare
    read only = No
    create mask = 0770
    directory mask = 0771

[guest]
    comment = Read/Write Guest Account Access
    path = /home/samba-guest
    force group = sambashare
    read only = No
    create mask = 0775
    directory mask = 0775
    guest only = Yes
    guest ok = Yes

[storage]
    comment = Music
    path = /home/daniel/storage

Note:
* samba version is 3.6.6
* the client is running Windows 7 Home Premium
* I have a firewall with iptables on this computer, but it's doing only ICS at the moment of these tests. All rules are set on ACCEPT by default.

Best Answer

The Windows 7 network client requires packet signing by default (to prevent man-in-the-middle attacks), and Samba disables packet signing by default. It may be that your client and server are failing to negotiate with each other on this item. So you could resolve it in one of two ways.

Server Side Solution: Enable Packet Signing on Samba

Add the following to your smb.conf:

server signing = auto

Restart the service and try again.

You could also try mandatory instead of auto. Read the docs here.

Client Side Solution: Disable Packet Signing on the Microsoft Network Client

First, open the Local Group Policy Editor:

  1. Press the Start button
  2. Type gpedit.msc in the Start search box and press Enter

In the Local Group Policy Editor, go to:

Local Computer Policy->
  Computer Configuration->
    Windows Settings->
      Security Settings->
        Local Policies->
          Security Options

Find the policy:

Microsoft network client: Digitally sign communications (always)

If this is enabled, change it to Disabled. Press Apply, restart the computer, and try again.

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