![]() If you're not using NAT (all of your IP addresses are public), you can still configure a firewall allow rule for port 139 for just your server's public IP address while denying access for others. Achieve superior cybersecurity outcomes through a fully-managed MDR service or self-managed security operations platform. ![]() Filtering specific service requests from an external IPv4 address to specific internal IP addresses is sometimes called port address translation (PAT). ![]() To avoid exposing local Windows users to outside connections from guests, you may want to configure your network's firewall (router, gateway, or managed switch) to forward all traffic for ports 137, 138, and 139 to your server if you're using network address translation (NAT). Many firewalls are automatically configured to block ports 137, 138, and 139 because many Windows users leave guest access enabled for shared files and printers. Windows Names and Browsing use ports 137 and 138, although you only need port 139 open to be able to connect to the server using an IP address or DNS name. The Windows file service uses TCP port 139. If the Mac doesn't 'see' the windows file server, you can always use the 'full name' or IP address of that server, starting the address name by 'smb://' in the 'Connect' dialog (Cmd + K in the Finder) : See this Apple Note for more details. ![]() Check your server's firewall settings and your network's firewall settings.
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