TCPclient | Un client TCP simple pour test | Runtime Evironment library

I am not receiving the Content posted by the HTTPClient but I can read the other information such as Content-Length and other headers. Let me explain the code here:

Here is the Server Code :

I have a .NET5.0 standalone service (which is installed as a windows service) which starts a basic SignalR hub. It uses Http.Sys internally has some other API controllers, and I'm currently connecting to it from a WinForms client using HubConnection.

It works perfectly on my development machine, but when I move it into an Azure VM (server 2019 datacentre) the first WebSocket call from the client hangs for a while, then fails. It then seems to "work" from then on, but very, very slowly (too slow to use).

I have opened the appropriate ports incoming and outgoing on the Azure server, and in Azure portal.

If I run my Winforms client on a different azure VM in the same virtual network, it all works fine. Therefore, I am sure the server works correctly, it only fails when I come in over the internet.

The server logfile shows this when I try to connect externally:

2021-11-24 17:10:19.6884|1|DEBUG|Microsoft.AspNetCore.SignalR.Internal.DefaultHubDispatcher|Received hub invocation: InvocationMessage { InvocationId: "1", Target: "GetAllState", Arguments: [ ], StreamIds: [ ] }. 17:10:31.1564|4|DEBUG|Microsoft.AspNetCore.Http.Connections.Internal.Transports.WebSocketsTransport|Waiting for the application to finish sending data. 2021-11-24 17:10:31.1564|12|DEBUG|Microsoft.AspNetCore.Http.Connections.Internal.Transports.WebSocketsTransport|Error writing frame. System.Threading.Tasks.TaskCanceledException: A task was canceled. at System.Net.WebSockets.ManagedWebSocket.SendFrameFallbackAsync(MessageOpcode opcode, Boolean endOfMessage, ReadOnlyMemory1 payloadBuffer, CancellationToken cancellationToken) at System.Net.WebSockets.WebSocketExtensions.SendMultiSegmentAsync(WebSocket webSocket, ReadOnlySequence1 buffer, WebSocketMessageType webSocketMessageType, CancellationToken cancellationToken) at Microsoft.AspNetCore.Http.Connections.Internal.Transports.WebSocketsServerTransport.StartSending(WebSocket socket) 2021-11-24 17:10:31.1564|2|DEBUG|Microsoft.AspNetCore.Http.Connections.Internal.Transports.WebSocketsTransport|Socket closed.

The client shows this:

2021-11-24 18:55:43.4679|50|ERROR|Microsoft.AspNetCore.SignalR.Client.HubConnection|The server connection was terminated with an error. System.Net.WebSockets.WebSocketException (0x80004005): The remote party closed the WebSocket connection without completing the close handshake. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.. ---> System.Net.Sockets.SocketException (10054): An existing connection was forcibly closed by the remote host.

I have looked at so many articles trying to fix this but I can't find anything relevant. It must be config-related, and it must be at "azure portal" level because the service works across the LAN. Does anyone have any idea what I need to do to get this running?

Update:

I created a couple of console apps using TcpListener and TcpClient on a new custom port, ran the server app on my Azure VM, connected to it successfully across the internet, and passed messages between the two. Very confused as to why the WebSocket fails to work over the internet.

Update2:

I changed the service to use Kestrel and it now works as expected. So, for whatever reason it refuses to work over the internet using Http.Sys. I was only using Http.Sys to have basic auth for some other clients that won't be using this service so Kestrel will work fine.

I want my TCP client to connect to multiple servers(each server has a separate IP and port).
I am using async_connect. I can successfully connect to different servers but the read/write fails since the server's corresponding tcp::socket object is not available.
Can you please suggest how I could store each server's socket in some data structure? I tried saving the IP, socket to a std::map, but the first server's socket object is not available in memory and the app crashes.
I tried making the socket static, but it does not help either.

Please help me!!

Also, I hope I am logically correct in making a single TCP client connect to 2 different servers. I am sharing below the simplified header & cpp file.

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I'm working on a peer-to-peer file sharing application that can be used to transfer files without having a central server.

It works like a charm when it comes to one-to-one file transfer, however I originally planned it in a way, that the sender can send files to multiple clients.

The app uses TCP Hole Punching so port forwarding is not necessary. The problem is, that in order to make TCP hole punch work, I need to specify a local port for each TCPClient. Thus, I need to bind the sockets.

I am trying to use WebClient to consume an endpoint which provides a token. Using Postman it works as expected. Exported curl from postman is:

I run client code on Unity and server code on a console application. The problem is that when the server sent a 'welcome' message to the client, the client receives an empty message. But weirdly when I run the code on Unity in debug mode it works well. Does anyone know why this happens?

Here is the client code

I have simple TcpListener which accepts a pending connection and I read data from NetworkStream with using a StreamReader.ReadLineAsync.

TcpClient writes data to the stream.

According to documentation

A line is defined as a sequence of characters followed by a line feed ("\n"), a carriage return ("\r"), or a carriage return immediately followed by a line feed ("\r\n")

The problem is that StreamReader.ReadLineAsync ignores the carriage return and never reads the line.

Server:

Any ideas on why I can't get a unity C# server and python client on the same network to play nicely?

C# server