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I have a new Mac set up as a home server. I can use the Finder's Go | Connect to Server... from local Macs to connect with smb://my-new-server.local, but can't connect from outside my LAN. I've tried smb://myregistereddomain.net and smb://xxx.yyy.zzz.www (my actual static IP address).

I have set my router to forward TCP traffic on port 445 to the server. What am I missing?

Update: have now added forwarding of port 139 but still no luck connecting. Verified that my ISP doesn't block these ports. Could this be something Apple just doesn't allow?

Could a remote user somehow tunnel into my LAN and access the SMB server that way? Where are instructions on doing this?

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  • This sounds like a router issue, not an Apple one. Did you forward ports 139 and 445 in the router to your Mac server?
    – Allan
    Commented Jun 12, 2023 at 23:02
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    This is very dangerous. You really should not be opening your router for incoming SMB connections. Some ISPs block SMB for your protection.
    – Gilby
    Commented Jun 12, 2023 at 23:24
  • So I need port 139 too?
    – Rob Lewis
    Commented Jun 13, 2023 at 0:04
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    Why are you assuming it’s an Apple issue? It works locally which means the server is functioning as it should. The only problem you’re having a connection that goes through your router is failing. This is a router/network issue. @Gilby is correct, this is quite dangerous and a VPN would be much better, but if you’re not secure on basic port forwarding and NAT traversal, then setting up a VPN (yourself) might be outside your wheelhouse. Why doesn’t a cloud solution work for you?
    – Allan
    Commented Jun 13, 2023 at 19:31
  • Also, SMB traffic over high latency connections like the Internet is horrible in terms of performance
    – Allan
    Commented Jun 13, 2023 at 19:35

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