When incoming traffic attempts to open a port for connectivity on your network, the router needs to be configured to forward that traffic appropriately. Glossing over some details here, Network Address Translation allows traffic headers to be modified to route traffic from your public IP to your actual machine's IP on the network. You don't notice this in your day-to-day life thanks to the power of Network Address Translation (NAT) and Universal Plug and Play (UPnP). Traffic is coming from the Internet to your machine, and your router either cannot or will not forward the traffic to your computer's machine. Your router needs to know where to send this traffic internally on your network. Network traffic sent to you via your public IP address reaches your router on a given port via a specific networking protocol. Is your development machine behind a router? Why does that happen and how do I fix it? Why is the server refusing the connection? Didn't I specifically tell it to listen to all interfaces with IPAddress.Any? I tried disabling my firewall but it's still not working. Because of that the client was unable to connect to the server on the same machine with the exception No connection could be made because the target machine actively refused it. But, knowing that the server and the client won't be necessarily run on the same machine in the future, I changed it to my public IP from ( IPAddress.Parse(.)). I use IPAddress.Loopback because I run the programs on the same machine. The client connects to the server using these lines (simplified): var client = new TcpClient(AddressFamily.InterNetwork) Ĭlient.Connect(IPAddress.Loopback, 7070) The server starts listening to incoming connections using these lines: var listener = new TcpListener(IPAddress.Any, 7070) While developing the program I run the server and the client on the same machine for convenience. I have a server program and a client program.
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