opensockets count=0

I have below code
after create API and use the correct APIKEY and APISECRET
but the "biananceClient" hopen sockets count=0
I think I have a problem to connect
should I open any port in my firewall?
var apiClient = new ApiClient("APIKEY",SECRETKEY");
            var binanceClient = new BinanceClient(apiClient);
            var test =await binanceClient.TestConnectivity();