我的问题如下：
我有一台运行Ubuntu 16.04的Azure VM，我有一个Express应用程序
http.createServer(app).listen(80, function(){
console.log('App running on port 80'.);
});
我允许ufw启用端口80，Azure规则也是如此。
我已完成sudo setcap 'cap_net_bind_service=+ep' /usr/bin/node
然后我pm2 start index.js。
应用程序启动没有日志，但我尝试从我的本地计算机访问它并获取：
curl -I http://parse.sensa-platform.com/public/test.txt
curl: (7) Failed to connect to parse.sensa-platform.com port 80: Connection refused
应该输出Banans。
我可以在VM内curl。
不知道该怎么做。请帮忙。
netstat -an | grep 80
tcp 0 0 10.0.0.4:45152 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45282 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45262 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45202 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:44480 13.95.240.73:443 TIME_WAIT
tcp 0 0 10.0.0.4:45312 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45292 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45232 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45212 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45192 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45252 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45162 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45172 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45222 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45322 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45182 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45272 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45242 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45302 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:45142 168.63.129.16:80 TIME_WAIT
tcp 0 0 10.0.0.4:44380 13.95.240.73:443 TIME_WAIT
tcp6 0 0 :::80 :::* LISTEN