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Tested with .Net Framework 4.6.2 on Azure. It does not work, have enabled system.net tracing.

 `System.Net Information: 0 : [12712] SecureChannel#3644764 - Certificate is of type X509Certificate2 and contains the private key. System.Net Information: 0 : [12712] AcquireCredentialsHandle(package = Microsoft Unified Security Protocol Provider, intent = Outbound, scc = System.Net.SecureCredential) System.Net Information: 0 : [12712] InitializeSecurityContext(credential = System.Net.SafeFreeCredential_SECURITY, context = 6801dc65d0:db724b14d0, targetName = mss.swicpc.bankgirot.se, inFlags = ReplayDetect, SequenceDetect, Confidentiality, AllocateMemory, InitManualCredValidation) System.Net Information: 0 : [12712] InitializeSecurityContext(In-Buffers count=2, Out-Buffer length=1638, returned code=ContinueNeeded). System.Net.Sockets Verbose: 0 : [12712] Socket#66404974::BeginSend() System.Net.Sockets Verbose: 0 : [23872] Data from Socket#66404974::PostCompletion System.Net.Sockets Verbose: 0 : [23872] (printing 1024 out of 1638) System.Net.Sockets Verbose: 0 : [12712] Exiting Socket#66404974::BeginSend() -> OverlappedAsyncResult#29753716 System.Net.Sockets Verbose: 0 : [23872] 00000000 : 16 03 03 06 2E 0B 00 04-9C 00 04 99 00 04 96 30 : ...............0 System.Net.Sockets Verbose: 0 : [23872] 00000010 : 82 04 92 30 82 02 7A A0-03 02 01 02 02 08 1B 46 : ...0..z........F System.Net.Sockets Verbose: 0 : [23872] 00000020 : F2 54 AE 99 F3 1C 30 0D-06 09 2A 86 48 86 F7 0D : .T....0...*.H... System.Net.Sockets Verbose: 0 : [23872] 00000030 : 01 01 0B 05 00 30 73 31-0B 30 09 06 03 55 04 06 : .....0s1.0...U.. System.Net.Sockets Verbose: 0 : [23872] 00000040 : 13 02 53 45 31 1D 30 1B-06 03 55 04 0A 0C 14 54 : ..SE1.0...U....T System.Net.Sockets Verbose: 0 : [23872] 00000050 : 65 73 74 62 61 6E 6B 20-32 20 41 42 20 28 70 75 : estbank 2 AB (pu System.Net.Sockets Verbose: 0 : [23872] 00000060 : 62 6C 29 31 11 30 0F 06-03 55 04 05 13 08 54 45 : bl)1.0...U....TE System.Net.Sockets Verbose: 0 : [23872] 00000070 : 53 54 53 45 54 32 31 32-30 30 06 03 55 04 03 0C : STSET21200..U... System.Net.Sockets Verbose: 0 : [23872] 00000080 : 29 54 65 73 74 62 61 6E-6B 20 32 20 43 75 73 74 : )Testbank 2 Cust System.Net.Sockets Verbose: 0 : [23872] 00000090 : 6F 6D 65 72 20 43 41 31-20 76 31 20 66 6F 72 20 : omer CA1 v1 for System.Net.Sockets Verbose: 0 : [23872] 000000A0 : 53 77 69 73 68 20 54 65-73 74 30 1E 17 0D 31 35 : Swish Test0...15 System.Net.Sockets Verbose: 0 : [23872] 000000B0 : 31 30 32 36 32 33 30 30-30 30 5A 17 0D 31 37 31 : 1026230000Z..171 System.Net.Sockets Verbose: 0 : [23872] 000000C0 : 30 32 36 32 31 35 39 35-39 5A 30 37 31 0B 30 09 : 026215959Z071.0. System.Net.Sockets Verbose: 0 : [23872] 000000D0 : 06 03 55 04 06 13 02 53-45 31 13 30 11 06 03 55 : ..U....SE1.0...U System.Net.Sockets Verbose: 0 : [23872] 000000E0 : 04 0A 0C 0A 35 35 36 39-31 33 37 33 38 32 31 13 : ....55691373821. System.Net.Sockets Verbose: 0 : [23872] 000000F0 : 30 11 06 03 55 04 03 0C-0A 31 32 33 31 31 38 31 : 0...U....1231181 System.Net.Sockets Verbose: 0 : [23872] 00000100 : 31 38 39 30 82 01 22 30-0D 06 09 2A 86 48 86 F7 : 1890.."0...*.H.. System.Net.Sockets Verbose: 0 : [23872] 00000110 : 0D 01 01 01 05 00 03 82-01 0F 00 30 82 01 0A 02 : ...........0.... System.Net.Sockets Verbose: 0 : [23872] 00000120 : 82 01 01 00 BC CF F1 F1-62 AB 84 50 EC 91 13 A9 : ........b..P.... System.Net.Sockets Verbose: 0 : [23872] 00000130 : 6B FE 20 78 32 01 54 E9-84 8F FD 4C 77 61 EB B5 : k. x2.T....Lwa.. System.Net.Sockets Verbose: 0 : [23872] 00000140 : 1F 86 66 E8 C9 17 35 37-DB F3 7B 07 72 AA 80 D5 : ..f...57..{.r... System.Net.Sockets Verbose: 0 : [23872] 00000150 : 79 C5 AB AD C7 92 E0 55-4C 03 3C ED D7 49 4E D6 : y......UL.Mj.0{N..... System.Net.Sockets Verbose: 0 : [23872] 00000220 : 9E 39 36 3F 02 03 01 00-01 A3 66 30 64 30 12 06 : .96?......f0d0.. System.Net.Sockets Verbose: 0 : [23872] 00000230 : 03 55 1D 20 04 0B 30 09-30 07 06 05 2A 03 04 05 : .U. ..0.0...*... System.Net.Sockets Verbose: 0 : [23872] 00000240 : 01 30 0E 06 03 55 1D 0F-01 01 FF 04 04 03 02 07 : .0...U.......... System.Net.Sockets Verbose: 0 : [23872] 00000250 : 80 30 1D 06 03 55 1D 0E-04 16 04 14 60 78 11 F2 : .0...U......`x.. System.Net.Sockets Verbose: 0 : [23872] 00000260 : 80 61 20 15 74 29 36 9E-F8 96 1E 7D 33 6C 7F F8 : .a .t)6....}3l.. System.Net.Sockets Verbose: 0 : [23872] 00000270 : 30 1F 06 03 55 1D 23 04-18 30 16 80 14 26 CD F1 : 0...U.#..0...&.. System.Net.Sockets Verbose: 0 : [23872] 00000280 : 34 AD 9D 0F 17 DC 90 6D-AE B2 BB DF BE A0 0C F5 : 4......m........ System.Net.Sockets Verbose: 0 : [23872] 00000290 : 40 30 0D 06 09 2A 86 48-86 F7 0D 01 01 0B 05 00 : @0...*.H........ System.Net.Sockets Verbose: 0 : [23872] 000002A0 : 03 82 02 01 00 16 18 A4-67 4E 78 3C B7 1F 91 F5 : ........gNx|.... System.Net.Sockets Verbose: 0 : [23872] 000002D0 : F1 DD 3E DE 05 F1 7A FC-5A D1 E4 78 33 80 8C 84 : ..>...z.Z..x3... System.Net.Sockets Verbose: 0 : [23872] 000002E0 : EF 68 FD 90 13 E7 77 35-B9 8E B4 3C 0F 2C DE 55 : .h....w5...uM..V..F... System.Net.Sockets Verbose: 0 : [23872] 00000370 : DE DB 8D 63 2A 46 C2 3E-31 1E 01 DA B1 57 EE FD : ...c*F.>1....W.. System.Net.Sockets Verbose: 0 : [23872] 00000380 : A6 0C A1 09 8F 03 41 2D-4D 77 19 A9 61 22 50 01 : ......A-Mw..a"P. System.Net.Sockets Verbose: 0 : [23872] 00000390 : F9 72 46 A7 42 20 03 16-91 F4 37 00 78 73 5D 8E : .rF.B ....7.xs]. System.Net.Sockets Verbose: 0 : [23872] 000003A0 : 05 21 01 FB C7 5D D4 AD-39 41 F4 3C 07 BC 9C 03 : .!...]..9A. Int32#1638 System.Net.Sockets Verbose: 0 : [23872] Socket#66404974::BeginReceive() System.Net.Sockets Verbose: 0 : [12712] Data from Socket#66404974::PostCompletion System.Net.Sockets Verbose: 0 : [12712] 00000000 : 15 03 03 00 02 : ..... System.Net.Sockets Verbose: 0 : [12712] Socket#66404974::EndReceive(OverlappedAsyncResult#64760428) System.Net.Sockets Verbose: 0 : [12712] Exiting Socket#66404974::EndReceive() -> Int32#5 System.Net.Sockets Verbose: 0 : [23872] Exiting Socket#66404974::BeginReceive() -> OverlappedAsyncResult#64760428 System.Net.Sockets Verbose: 0 : [23872] Socket#66404974::BeginReceive() System.Net.Sockets Verbose: 0 : [12712] Data from Socket#66404974::PostCompletion System.Net.Sockets Verbose: 0 : [12712] 00000000 : 02 28 : .( System.Net.Sockets Verbose: 0 : [12712] Socket#66404974::EndReceive(OverlappedAsyncResult#27335310) System.Net.Sockets Verbose: 0 : [12712] Exiting Socket#66404974::EndReceive() -> Int32#2 System.Net.Sockets Verbose: 0 : [23872] Exiting Socket#66404974::BeginReceive() -> OverlappedAsyncResult#27335310 System.Net Information: 0 : [23872] InitializeSecurityContext(credential = System.Net.SafeFreeCredential_SECURITY, context = 6801dc65d0:db724b14d0, targetName = mss.swicpc.bankgirot.se, inFlags = ReplayDetect, SequenceDetect, Confidentiality, AllocateMemory, InitManualCredValidation) System.Net Information: 0 : [23872] InitializeSecurityContext(In-Buffers count=2, Out-Buffer length=0, returned code=IllegalMessage). System.Net.Sockets Verbose: 0 : [23872] Socket#66404974::Dispose() System.Net Error: 0 : [23872] Exception in HttpWebRequest#15120020:: - The request was aborted: Could not create SSL/TLS secure channel.. System.Net Verbose: 0 : [23872] HttpWebRequest#15120020::EndGetRequestStream() System.Net Error: 0 : [23872] Exception in HttpWebRequest#15120020::EndGetRequestStream - The request was aborted: Could not create SSL/TLS secure channel..` 

 [HttpGet("{id}")] public async Task pay(string id = "", string amount = "") { // Get the user agent string userAgent = Request.Headers["User-Agent"].ToString(); // Create the payment request SwishPaymentRequest post = new SwishPaymentRequest(); post.payeePaymentReference = id.ToString(); post.callbackUrl = "https://www.quiz-walk.se/"; post.payeeAlias = "1231181189"; post.amount = amount; post.currency = "SEK"; post.message = "Faktura " + id.ToString(); // Create the http content HttpContent data = new StringContent(JsonConvert.SerializeObject(post), Encoding.UTF8, "application/json"); // Create variables X509Store certStore = null; HttpClientHandler handler = null; HttpClient client = null; string token = ""; try { // Create a request handler handler = new HttpClientHandler(); handler.ClientCertificateOptions = ClientCertificateOption.Manual; handler.SslProtocols = SslProtocols.Tls12 | SslProtocols.Tls11 | SslProtocols.Tls; handler.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; // Open certificate from certificate store certStore = new X509Store(StoreName.My, StoreLocation.CurrentUser); certStore.Open(OpenFlags.OpenExistingOnly | OpenFlags.ReadOnly); X509Certificate2Collection certCollection = certStore.Certificates.Find(X509FindType.FindByThumbprint, "800CDE7BC219D53812FC164DFF0FE73DF8A8D7B6", false); if (certCollection.Count > 0) { handler.ClientCertificates.Add(certCollection[0]); } // Disable ssl validation handler.ServerCertificateCustomValidationCallback += (message, xcert, chain, errors) => true; //handler.ClientCertificates.Add(cert); // Create the http client client = new HttpClient(handler, false); // Post the payment request //Task task = Task.Run(() => client.PostAsync("https://mss.swicpc.bankgirot.se/swish-cpcapi/api/v1/paymentrequests/", data)); HttpResponseMessage task = await client.PostAsync("https://mss.swicpc.bankgirot.se/swishcpcapi/api/v1/paymentrequests/", data); // Wait for the task to finish //task.Wait(); // Make sure that the response is successful if (task.StatusCode == System.Net.HttpStatusCode.Created) { // Get all header values IEnumerable headers = task.Headers.GetValues("PaymentRequestToken"); // Get the token foreach (string value in headers) { token += value; } } } catch (Exception ex) { token += ex.ToString(); logger.LogWarning(ex.ToString()); } finally { // Dispose of the handler and the client if(certStore != null) { certStore.Dispose(); } if (handler != null) { handler.Dispose(); } if (client != null) { client.Dispose(); } } // Create the url string url = "http://www.bokforingstips.se"; if (userAgent.Contains("Windows Phone") == true) { url = "swish://paymentrequest?token=" + token; } else if (userAgent.Contains("iPhone") == true || userAgent.Contains("iPad") == true) { url = "swish://paymentrequest?token=" + token; } else if (userAgent.Contains("Android") == true) { url = "intent://paymentrequest?token=" + token + "/#Intent;scheme=swish;package=se.bankgirot.swish;end;"; } else { return Content(handler.ClientCertificates[0].Issuer + " " + token); } // Redirect the user to url return Redirect(url); } // End of the pay method 

 [HttpGet("{id}")] public async Task pay(string id = "", string amount = "") { // Get the user agent string userAgent = Request.Headers["User-Agent"].ToString(); // Create the payment request SwishPaymentRequest post = new SwishPaymentRequest(); post.payeePaymentReference = id.ToString(); post.callbackUrl = "https://www.quiz-walk.se/"; post.payeeAlias = "1231181189"; post.amount = amount; post.currency = "SEK"; post.message = "Faktura " + id.ToString(); // Create the http content HttpContent data = new StringContent(JsonConvert.SerializeObject(post), Encoding.UTF8, "application/json"); // Create variables X509Store certStore = null; HttpClientHandler handler = null; HttpClient client = null; string token = ""; try { // Create a request handler handler = new HttpClientHandler(); handler.ClientCertificateOptions = ClientCertificateOption.Manual; handler.SslProtocols = SslProtocols.Tls12 | SslProtocols.Tls11 | SslProtocols.Tls; handler.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; // Open certificate from certificate store certStore = new X509Store(StoreName.My, StoreLocation.CurrentUser); certStore.Open(OpenFlags.OpenExistingOnly | OpenFlags.ReadOnly); X509Certificate2Collection certCollection = certStore.Certificates.Find(X509FindType.FindByThumbprint, "800CDE7BC219D53812FC164DFF0FE73DF8A8D7B6", false); if (certCollection.Count > 0) { handler.ClientCertificates.Add(certCollection[0]); } // Disable ssl validation handler.ServerCertificateCustomValidationCallback += (message, xcert, chain, errors) => true; //handler.ClientCertificates.Add(cert); // Create the http client client = new HttpClient(handler, false); // Post the payment request //Task task = Task.Run(() => client.PostAsync("https://mss.swicpc.bankgirot.se/swish-cpcapi/api/v1/paymentrequests/", data)); HttpResponseMessage task = await client.PostAsync("https://mss.swicpc.bankgirot.se/swish-cpcapi/api/v1/paymentrequests/", data); // Wait for the task to finish //task.Wait(); // Make sure that the response is successful if (task.StatusCode == System.Net.HttpStatusCode.Created) { // Get all header values IEnumerable headers = task.Headers.GetValues("PaymentRequestToken"); // Get the token foreach (string value in headers) { token += value; } } } catch (Exception ex) { token += ex.ToString(); logger.LogWarning(ex.ToString()); } finally { // Dispose of the handler and the client if(certStore != null) { certStore.Dispose(); } if (handler != null) { handler.Dispose(); } if (client != null) { client.Dispose(); } } // Create the url string url = "http://www.bokforingstips.se"; if (userAgent.Contains("Windows Phone") == true) { url = "swish://paymentrequest?token=" + token; } else if (userAgent.Contains("iPhone") == true || userAgent.Contains("iPad") == true) { url = "swish://paymentrequest?token=" + token; } else if (userAgent.Contains("Android") == true) { url = "intent://paymentrequest?token=" + token + "/#Intent;scheme=swish;package=se.bankgirot.swish;end;"; } else { return Content(handler.ClientCertificates[0].Issuer + " " + token); } // Redirect the user to url return Redirect(url); } // End of the pay method 

I am testing the Swish API and I use ServerCertificateCustomValidationCallback to do my on validation. I works on my local computer but not on Azure.

I am testing the Swish API and I use ServerCertificateCustomValidationCallback to do my on validation. I works on my local computer but not on Azure. The certificate is loaded, the error occurs on the PostAsync call.

Asp.Net Core 1.1.1