尝试在 UWP/C# 中重新创建 Microsoft 的 .net 异步客户端/服务器套接字示例

Question

I am trying to recreate Microsoft's .net examples for simple client/server communication in an c# uwp app. Later on I would like to send simple data from one app to another.

Asynchronous Client Socket Example https://docs.microsoft.com/en-us/dotnet/framework/network-programming/asynchronous-client-socket-example

Asynchronous Server Socket Example https://docs.microsoft.com/en-us/dotnet/framework/network-programming/asynchronous-server-socket-example

I haven't made any crucial changes but modified the ipHostInfo like this:

        IPHostEntry ipHostInfo = Dns.GetHostEntry("localhost");
        ipAddress = ipHostInfo.AddressList[0];

At first I implemented client and server class in the same app which was working fine (but of course useless) . Now when trying to separate client and server (1 app for the client example and 1 app for server example). The client is not able to connect to server. I successfully connected the client to some other listening ports (found in resource monitor) so problem must be the server which seams not to listen for connection requests from 'outside the own app'.

In resource monitor the server-app is shown in the 'Listening Ports' list as IPv4/IPv6 loopback, TCP protocol, firewall status: allowed, not restricted. (tried IPv4/v6 localhost) I also added Private Networks (Client and Server) Capabilities in the manifest. Anyone an idea what might be the problem?

Answer 1

I finally figured it out: Inbound loopbacks have to be explicitly enabled in regedit + running cmd/CheckNetIsolation.exe for UWP apps. https://docs.microsoft.com/en-us/windows/iot-core/develop-your-app/loopback