C # - Could not connect because target computer actively refused it

Question

Good day. I'm having a problem because the Client won't connect to the server. When the server listens on the port, e.g. 8061, I set the Client to the same port, but when I click the submit button to send the message to the server, an error appears: Client: Server:

Dżyszla · Answer

Either listening does not start at all (check netstat -an) or the firewall is blocking.

DDoS132 · Answer

While enabling the listening device, the Firewall asked whether to allow the program to do so and I indicated that it should do so. VS 2019 marks the error when clicking the Submit button in the line where there is TcpClient client = new TcpClient (serverIP, port);

Dżyszla · Answer

Nevertheless, check that there is actually a watch. Do you run the server normally or from the debugger?
In general - why the option to enter an address in the server? After all, he must always have localhost / 127.0.0.1. And I would just use IPAddress.Parse ("127.0.0.1") instead of asking the DNS. I also understand that in the server console you let it go further (Read - rather unnecessary at all).

DDoS132 · Answer

I made the option of adding my own IP so that later I could connect computers from outside the network. (By port forwarding, or ngroka or hamachi). I set up what you said and in netstat you could see 127.0.0.1:9081 (this is the port I created this time) LISTENING, but there is another problem. When I send a message from the Client, the server receives nothing. After doing netstat -an, I saw something like this again. Code: text Expand Select all Copy to clipboard  TCP    127.0.0.1:9081         0.0.0.0:0              LISTENING                                                          TCP    127.0.0.1:9081         127.0.0.1:2531         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2532         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2540         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2541         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2542         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2543         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2544         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2545         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2547         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2551         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2552         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2553         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2554         CLOSE_WAIT                                                         TCP    127.0.0.1:9081         127.0.0.1:2557         CLOSE_WAIT

DDoS132 · Answer

You had to click enter to start the loop haha. It's so simple it's hard to find ...

[Solved] C # - Could not connect because target computer actively refused it

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