SignalR The SSL connection could not be established

user_10654458 0
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I'm using SignalR to communicate between my ASP.NET server and Xamarin.Forms client. However, when I'm using https, HubConnection throws this exception when trying to .StartAsync() : System.Net.Http.HttpRequestException: 'The SSL connection could not be established, see inner exception. However, when I'm using http instead, all works fine. Please, help me! Thank you in advance!

xamarin.forms signalr asp.net c#
2 Answers

So, I solved it by upgrading Xamarin.Forms shared project .NETStandard version to 2.1, and rewriting HubConnectionBuilder this way: 

hubConnection = new HubConnectionBuilder().WithUrl(Properties.Resources.ServerIPAddress + "/test",
                options =>
                {
                    options.WebSocketConfiguration = conf =>
                    {
                        conf.RemoteCertificateValidationCallback = (message, cert, chain, errors) => { return true; };
                    };
                    options.HttpMessageHandlerFactory = factory => new HttpClientHandler
                    {
                        ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; }
                    };
                    options.AccessTokenProvider = () => Task.FromResult(Token);
                }).Build();
user_106544580 
 hubConnection = new HubConnectionBuilder()
     .WithUrl($"your host/chatHub", (opts) =>
     {
         opts.HttpMessageHandlerFactory = (message) =>
         {
             if (message is HttpClientHandler clientHandler)
                 // bypass SSL certificate
                 clientHandler.ServerCertificateCustomValidationCallback +=
                     (sender, certificate, chain, sslPolicyErrors) => { return true; };
             return message;
         };
     }).Build();
user_152761500
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