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SAMBA access uses TCP port 445, while windows uses ports 138-139 udp & tcp.
When the Linux FW is properly configured, there is no problem- - except
compatibility to Win/98, Macintosh and Linux shares
Windows systems need the setting
· Level 1, Send LM and NTLM—use NTLMv2 session security if negotiated
Running strictly V2 *WILL* fail
You have to be careful with your firewall for Samba. If you enable the firewall on the computer that is running Samba, it won't work. The Linux firewall is supposed to be used between your LAN and internet, but it can keep local users from using Samba. It is possible, but not all that easy, to configure your firewall so that Samba will be allowed to access only your network. It is easy to just run Samba on a different computer than the one on which you are running your firewall. Divide your tasks onto two machines - one for a file server and the other for a firewall.