• Open the Run command and type “secpol.msc”.
• Click on “Local Policies” –> “Security Options”
• Navigate to the policy “Network Security: LAN Manager authentication level” and open it.
• By default Windows 7 sets the policy to “Not Defined”. Change this to “Send LM and NTLM – use NTLMV2 session security if negotiated”.

Once you’ve done this Windows 7 will be able to view network drives based on Samba servers and should fix any issues around using Samba as a Primary Domain Controller.

To connect from another subnet, for example if your wlan is on another subnet, open the SMB protocoll in your firewall. Ports 445 and 139 need to be open.