Hi andrhadi,
best would be if you start without the firewall app, with some wrong configuration it could restrict you. Just delete your rules and disable the app.
For your app with a tcp server you have to use the corresponding plugs/slots so your app gets access to the network interface.
Check our go web server example. ctrlx-automation-sdk/samples-go/hello.webserver at main · boschrexroth/ctrlx-automation-sdk (github.com)
At first, I would try it without any encryption, if possible.
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