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If you can SSH in then most likely this means that your 8000 port is not open on the server, try this Ubuntu iptables guide
If your SSH works, then you can also use port forwarding through SSH
ssh user@server -L 8000:server:8000
This is the the ssh user@host -L localport:host:hostport
format
This will forward the 8000 port from your server, to your 8000 port locally, through the SSH tunnel, and in which case on your browser you’d use 127.0.0.1:8000
or localhost:8000
(as opposed to using the host/IP of the server)
Source:stackexchange.com