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I created a simple backend server using the Rust "Nickel" framework by following the guide here: https://nickel-org.github.io/getting-started.html

I can run cargo run locally and hit the local endpoint http://127.0.0.1:6767 via postman to get this response:

{
    message: "Hello! Sincerely, Jimbob's Rusty Nickel"
}

This is great, and I would like to deploy it live. I am using a micro aws ec2 instance with ubuntu 18.04 LTS. After I install cargo and run the app with cargo run I get the usual successful startup "waiting for requests" output:

Listening on http://127.0.0.1:6767
Ctrl-C to shutdown server

I have the ports for my server open with these settings:

Inbound:

80  tcp 0.0.0.0/0, ::/0      
22  tcp 0.0.0.0/0        
3000    tcp 0.0.0.0/0    
443 tcp 0.0.0.0/0, ::/0      
0-65535 tcp 0.0.0.0/0       
6767    tcp 0.0.0.0/0       

Outbound:

All All  0.0.0.0/0       
6767    tcp 0.0.0.0/0   

When I try to call to the live endpoint using either the ec2's Public DNS (IPv4) with port 6767 or the IPv4 Public IP with port 6767, I get this error response:

Could not get any response
There was an error connecting to http://3.83.65.51:6767.
Why this might have happened:
The server couldn't send a response:
Ensure that the backend is working properly
Self-signed SSL certificates are being blocked:
Fix this by turning off 'SSL certificate verification' in Settings > General
Proxy configured incorrectly
Ensure that proxy is configured correctly in Settings > Proxy
Request timeout:
Change request timeout in Settings > General

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