为什么我的裸露Docker端口不允许连接？

Question

我在Fargate / CloudFormation上有一个docker容器。我可以通过http客户端连接到端口8080上的socket.io服务器，但是不能直接连接tcp套接字连接（我们的iOS和Android应用程序直接连接，由于它们不使用webviews或http；而是套接字库，因此它们失败了）

如果我测试8080端口，它将失败，但是如果我测试80端口，它将连接（见下文）

 nc -vz produ-Publi-10SNDOZB9E1YC-1684595318.us-west-2.elb.amazonaws.com 8080
    nc: connectx to produ-Publi-10SNDOZB9E1YC-1684595318.us-west-2.elb.amazonaws.com port 8080 (tcp) failed: Connection refused
    nc: connectx to produ-Publi-10SNDOZB9E1YC-1684595318.us-west-2.elb.amazonaws.com port 8080 (tcp) failed: Connection refused


nc -vz produ-Publi-10SNDOZB9E1YC-1684595318.us-west-2.elb.amazonaws.com 80
    found 0 associations
    found 1 connections:
         1: flags=82<CONNECTED,PREFERRED>
        outif en0
        src 192.168.1.231 port 55691
        dst 52.32.233.92 port 80
        rank info not available
        TCP aux info available

    Connection to produ-Publi-10SNDOZB9E1YC-1684595318.us-west-2.elb.amazonaws.com port 80 [tcp/http] succeeded!

DockerFile：

FROM ubuntu:14.04

ENV DEBIAN_FRONTEND noninteractive

RUN mkdir /src
ADD package.json /src

RUN apt-get update
RUN apt-get install --yes curl
RUN curl --silent --location https://deb.nodesource.com/setup_4.x | sudo bash -
RUN apt-get install --yes nodejs
RUN apt-get install --yes build-essential

RUN update-alternatives --install /usr/bin/node node /usr/bin/nodejs 10



RUN cd /src; npm install
RUN npm install --silent socket.io@0.9.14


WORKDIR /src




# Bundle app source
# Trouble with COPY http://stackoverflow.com/a/30405787/2926832
COPY . /src

ADD app.js /src/


EXPOSE 8080

CMD ["node", "/src/app.js"]