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1I don't think it is your ISP. Have you done anything to troubleshoot your firewall rules on the pi? Maybe it only allows connections from your local network. How about tcpdump to see where the connection is breaking down?– AppleoddityCommented Sep 30, 2017 at 15:56
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Your ISP may be using CGNAT which is why you can't access it from outside your LAN. I had a similar problem with my port forwarding. Hope this post I've linked below helps you. Which IP address do I use to access my server?– ZohairCommented Sep 30, 2017 at 16:16
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I have done some digging and it seems that the pi has the firewall off by default. I don't think it is CGNAT. When I google "what is my ip" it matches what is listed on my router(from reading your link that seems to be one symptom).– Ramsey BissexCommented Sep 30, 2017 at 16:23
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Can you install wireshark on sometyhing. If so then port forward to the device with wireshark and ensure you can see the packets coming in after port translation also if you can setup a SSH server confirm you can see packets going out and going back out. If the ISP is blocking , then the only way is to get them to stop or try different ports. Since essentially you are trying the second that seems unlikely– RossCommented Dec 31, 2017 at 0:59
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You can use a service like tunnelin.com which will forward your connection through a secure tunnel and allow you to connect (ssh, vnc, https etc.) to your device over the internet. It does not require any configuration and not depend on your (ISP) network topology.– simonCommented Jun 27, 2020 at 23:34
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