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I got Ubuntu as host. I'm running a web-server on It is accessible from the local network, but when i'm trying to reach it by external ip, i go to my router's web-page.
So I arranged port forwarding on router for port 80 to my local ip
Unfortunately web-server is still unavailable via external ip. I checked whether the port is open via http://www.canyouseeme.org/. As it showed that the port is unavailable, I changed port used to 3659 (not forget to rearrange port forwarding rule). Although http://www.canyouseeme.org/ shows, that the port 3659 is open, i still can't reach my web-server.
Where can the problem be?

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