Allow traffic on AWS windows instance with flask restful
Based on the comments, the issue was windows firewall. 
The solution was to allow the connection in the firewall.
I created a aws windows instance (linux is sadly no option in this particular case) on which i deployd a python script using flask-restful. 
I added inbount traffic rules to allow http traffic on port 80. 
The Flask api is being hostet on host=0.0.0.0, port=80 and debug is False. 
The api is reachable via browser on the server running it.
Sadly im not able to reach the api from external servers. I thought it might be a internal issue between public and internal ip so i tryd reverse proxing that with nginx with no result as well. 
Does somebody have an idea what i could do.