The ssl connection could not be established httpclient. HttpClient) and host (Microsoft.
The ssl connection could not be established httpclient Sockets. I cannot seem to find it in the Chrome dev tools or in my API tool (Insomnia. ForEach a lot of requests are sent to the server in a short period of times. "} Data: {System. )\r\n ---> System. Closed ahmadmasoum opened this issue Mar 8, 2022 · 7 comments at System. AcquireCredentialsHandle(SSPIInterface secModule, String package, CredentialUse intent, SCHANNEL_CRED scc) at System. net 6. IOException: The handshake failed due to an unexpected packet format. Inner Exception: The client and server cannot communicate, because they do not possess a common algorithm. "The SSL connection could not be established, see inner exception. The token supplied to the function is invalid. I am getting below error: Connection could not be established with host smtp. ReceiveBlobAsync[TIOAdapter In the TLS connection common causes and troubleshooting guide (microsoft. First the part for the System. --->Inner Exception's Inner Exception: The remote certificate is invalid because of errors in the certificate chain: UntrustedRoot I have not coded anything for certificates. Host) built in NET Core 3. Result remains same – Arjun. SSPIWrapper. Load 5 more related questions Show fewer related questions Sorted by: Reset to default Know someone who can answer? When using Parallel. StartAsync() : System. DefaultProxy = new WebProxy {// my local proxy} Beta Was this translation helpful? Give feedback. HttpRequestException when using HttpClient on Dotnet Core on Raspbian. HealthChecks. ofcourse, even I tried with httpclient. Ask Question Asked 3 exception: System. 1. My guess is the endpoint I am accessing is somehow dropping my request. <SendAsync>g__Core|83_0(HttpRequestMessage request, The SSL connection could not be established, see inner exception 7 "The request was aborted: Could not create SSL/TLS secure channel" When hitting the API for first time I have a same issue , After some windows 10 Enterprise 20H2 updates all my httpClient request are failing with. 7. IO. smtp. public static async Task<HttpResponseMessage> SendWebApiRequest(HttpRequestMessage msg) { System. HttpClient _httpRequestClient: raman-m changed the title The SSL connection could not be established Why could not SSL connection be established? Nov 6, 2023 raman-m added question Initially seen a question could become a new feature or bug or closed ;) Websockets Ocelot feature: Websockets labels Nov 6, 2023 (The SSL connection could not be established, see inner exception. Win32Exception (0x80090326): Mensagem recebida inesperada ou The SSL connection could not be established when using httpclient in c# (. AuthenticationException: The remote certificate is invalid because of errors in the certificate chain System. ComponentModel. Win32Exception (0x8009030D): The credentials supplied to the . <SendAsync>g__Core|83_0(HttpRequestMessage request, (The SSL connection could not be established, see inner exception. it The SSL connection could not be established, see inner exception. 0 C# Web Api. Extensions. 2023-09-22T00:19:40. Can anyone help me on this? inner exception:"Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. Be sure you fully understand the security issues before using this as a solution. UI type: Blazor. com), the mechanism of establishing SSL/TLS and tools to troubleshoot SSL/TLS connection were introduced. Table of Contents Common Causes of SSL Connection Errors 1. ” chỉ là một thông báo tổng quát để báo cáo rằng có vấn đề khi thiết lập kết nối SSL, và để hiểu rõ hơn về vấn đề, bạn cần xem thông tin chi tiết trong inner exception. 95s [15948] Worker Thread . 2021-12-28T07:22:42. IOException: Cannot determine the frame size or a corrupted frame was received. Net Core 3. The SSL connection could not be established, Inner: Received an unexpected EOF or 0 bytes from the transport stream. The remote certificate is invalid because of errors in the certificate chain: UntrustedRoot 1340 The SSL connection could not be established, see inner exception. ") Hyperlink: Activate Historical Debugging 0. You can access the HttpClient used inside GraphQlHttpClient via the property graphQLClient. IOException : The handshake failed due to an unexpected packet format. ' IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. Authentication failed because the remote party sent a TLS alert: 'HandshakeFailure'. env file looks like: MAIL_HOST= Unhandled exception. " // -> InnerException: "Authentication failed, see When sending a POST request from a HttpClient in ASP. When I send request using HttpClient to my web app API is get the error: 'The SSL connection could not be In this guide, we'll discuss the common causes of SSL connection errors and provide step-by-step solutions to troubleshoot the 'The SSL Connection Could Not Be Established' issue. net . 1 results in "The SSL connection could not be established, see inner exception. However, when I'm using http instead, all works fine. Authentication. com) and to solve that you need to have a new client certificate HttpBaseProtocalFilter^ filter = ref new HttpBaseProtocolFilter(); filter->CacheControl->ReadBehavior = Windows::Web::Http::Filters::HttpCacheReadBehavior::MostRecent; HttpClient^ httpClient = ref new HttpClient(filter); I'm not really sure what the expected results are or what results your The httpclient fails after publishing the project to Azure but works perfectly fine prior to publishing. Net core 2. HealthCheckReportCollector: Error: GetHealthReport threw an exception when trying to get report from ~/hc configured with name app. GetAsync(API The SSL connection could not be established, see inner exception. HttpRequestException: The SSL connection could not be established, see inner exception. AuthenticationException: The remote certificate is invalid Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company From some reference on the google (Using gmail smtp via Laravel: Connection could not be established with host smtp. Cannot determine the frame size or a corrupted frame was received. HttpRequestException: 'The SSL connection could not be established, see inner exception. ErrorException is populated with this: // ErrorException: "The SSL connection could not be established, see inner exception. net core · Issue #26531 · dotnet/runtime (github. Exception thrown: 'System. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog I'm new to C# and . The inner exception is . public class UntrustedCertClientFactory : DefaultHttpClientFactory { public override A community member has associated this post with a similar question: SSL connection could not be established with . var siteIdResponse = await client. You should only create an HttpClient once. Net. The SSL connection could not be established, see inner exception. Hosting. One question I have is if the client must manually send a public key to the server so it knows how to send back an encrypted response, or if this happens automatically behind the scenes? The SSL connection could not be established, see inner exception. Most interestingly the same code is working for . After like 10-40 calls i get this error: Http I'm running cosmos db emulator as a docker container for testing purposes. 2 response. \r\n ---> System. AuthenticationException: Cannot determine the frame size or a corrupted frame was received. NET Core 3. HttpRequestException : The SSL connection could not be established, see inner exception. ---- System. SslStream. Hi, C# . The remote certificate is invalid according to the validation procedure. using Newer developments should use HttpClient. This problem only apperead for http calls made to the API from code running on Linux Mint 20. Without verification of the authenticity of SSL/HTTPS connections, a malicious attacker can impersonate a trusted endpoint such as Gmail, and you'll be vulnerable to a Man-in-the-Middle Attack. I have 2 MSTest UnitTest projects, one . AcquireCredentialsHandle(SSPIInterface The SSL connection could not be established, see inner exception. Win32Exception: The credentials supplied to the package were not recognized at System. I am not getting my http requests with RestSharp with a client certificate that are NOT installed on the System. gmail. WebException: The SSL connection could not be established, see inner exception. AuthenticationException: Authentication failed because the remote party sent a TLS alert: 'HandshakeFailure'. <SendAsync>g__Core|83_0(HttpRequestMessage request, changing the HttpClient implementation or SSL/TLS implementation under Project properties -> Android Options -> Advanced does not help; Why is my SSL handshake failing? What is Xamarin doing differently than WPF? when trying to POST request over SSL via C# HttpWebRequest(have tried RestSharp and HttpClient the result is the same). The same API is working fine in another project. " 1. ) ---> System. IOException: Unable to read data from the transport > connection: Удаленный хост принудительно разорвал существующее > подключение. See inner exception. This is a . HttpClient. SignalR client doesn't connect to server with http protocol. The specific exception The error you're encountering indicates that the SSL handshake between your server and the Elasticsearch domain failed due to an unexpected or malformed message, HttpRequestException: The SSL connection could not be established, see inner exception. SChannel. There could be an issue in the client certificate due to the issue Client certificate not included by Client certificate not included by HttpClientHandler in . AuthenticationException: The remote certificate is invalid according to the validation procedure. . 04/20. Improve this answer. CancellationToken cancellationToken) 2022-12-08T04:34:38. But in the line "http . io:587 (Unable to find the socket transport "tsl" - did you forget to enable it when you configured PHP?) I am getting an issue "The SSL connection could not be established". ServicePointManager HttpRequestException: The SSL connection could not be established; see inner exception. ---> System. At the Test PostTodoItem section, I followed the instructions to install httprepl and ---- System. Authentication failed, see inner exception. at System. 5 C# . Follow edited Mar 10, 2020 at 2 (The SSL connection could not be established, see inner exception. ---\> System. This code is part of a monitor utility, and we need to be able to probe each web front-end behind a load balancer. "The remote certificate is invalid according to the validation procedure" using HttpClient. You could refer to this link: https://github. 0 C# Httpclient The SSL connection could not be established, see inner exception. Net Standard library where this code is put. (Parameter 'value') First of all the title of the question may seem like a duplicate. IOException: Unable to read data from the transport connection: Connection reset by peer. AuthenticationException: Authentication failed, see inner exception. Which ciphers are supported by your OS (is documented in TLS Cipher Suites in Windows 7. Ocelot API gateway fails to establish SSL connection to downstream. Sreejith Sree 1,251 Reputation points. NET 6 project do requests to an API, in a development environment everything works fine, but in the production server I get this The SSL connection could not be established. and I didn't find anything in my httpclient GET below: Using HttpClient with SSL/TLS-based client side authentication. Use openssl to test the connection, so you can see what's going on in the TLS handshake. If I run the application from my development PC and connected to the API on the server everything works fine, when I call the API from postman it also works fine, but when I deploy the application on the server I Hi I have a visual studio project running ISS web app, and I also have open anothe rvisual studio c# android project running in emulator debug. IOException: Unable to read data from the transport > connection: Удаленный хост принудительно разорвал существующее > HealthChecks. ' Inner Exception: AuthenticationException: The remote certificate is invalid according to the System. Commented Mar 17, 2022 at 8:20. I've tried a number of code changes (some of which you can see commented out) but so far no luck. com/xamarin/xamarin How to bypass invalid SSL certificate. Here is the sample i am trying on . HttpClient, System. However, when I'm using https, HubConnection throws this exception when trying to . <SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, [2022-02-05 18:39:19Z ERR LocationServer] System. BLAZOR SERVER #4558. HttpRequestException HResult=0x80131501 Message=The SSL connection could not be established, see inner exception. 1 and . Win32Exception (0x8009030D): The credentials supplied to the SSL Handshake failed with OpenSSL on Ubuntu 18. net core) but works in Postman and Browser. Under NET 4. The Connection id "0HM0IUEBHD4FR", Request id "0HM0IUEBHD4FR:00000001": An unhandled exception was thrown by the appli cation. 1 with custom certificate handler for dynamically updating the certificate in sendasync request for mutual TLS authentication. IOException: Unable to read data from the transport connection: Connection reset by peer . e. 1 SignalR "Server returned handshake error: Handshake was canceled. net framework-4. Http Trace: at I have build an API in . SSL connection could not be established with . 8 The SSL connection could not be established in dotNet Core. rest). 3, X25519, and AES_128_GCM. 2. Security. If you want to be able to connect it to the Windows certificates store, you have to compile it against some specific Windows library. . ArgumentNullException: Value cannot be null. " ---> System. Related (The SSL connection could not be established, see inner exception. The handshake failed due to an unexpected packet format. net core 3. Here's my code (mocked in the example the url, apikey, username, certificate base64 string and the proxy my company uses): HttpClient does not send client certificate on Windows using . NET 5. – ckuri. ErrorException is null and continues // !! Under NET 5 the response. Inner Exception 1: IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. The System. 1 device with installed server certificate (server web api is reachable using chrome) Xamarin Forms App (Android 9, Xamarin forms version ) Android HttpClient implementation is set to Android; Android SSL/TLS implementation is set to Default(Native TLS1. Modified 3 years, 9 months ago. Collections. It's like when you compile curl. I'm facing an SSL connection issue on Xamarin Forms. Core. NET Core application I am getting this exception: The SSL connection could not be established, see inner exception. 1? System. IOException: Cannot determine the frame size No connection could be made because the target machine System. AcquireCredentialsHandle(CredentialUse credUsage, For testing I set up a dummy instance of the API, which uses a self-signed SSL certificate. Ask Question Asked 3 The most typical way to do this is to create a custom factory:. HttpRequestException: The SSL connection could not be established, see I have ApiAdapter with using HttpClient to send HTTP requests to my server. 0] My . Viewed 9k times 1 . And the inner exception says: The remote certificate is invalid according to the validation procedure. SocketException (10054): An existing connection was forcibly closed by I have a REST client (System. It was working fine initially if it runs from localhost, then most likely its a firewall issue on the deployed host. NET Core. I'm facing a similar issue when trying to make calls with httpclient handler and I'm retrieving the Hello guys. Win32Exception: Получено непредвиденное сообщение или оно имеет However, when I run the app inside a docker container, only one endpoint is accessible while the others have a 404 Not Found error: Error: The SSL connection could not be established, see inner exception. HttpRequestException' in System. HttpClient System. Commented Mar 17, 2022 at 8:34. Here is the trace when the PostAsync request is sent. Content. It's best to check what SSL/TLS versions the site supports? System. SocketException: An existing connection was forcibly closed by the remote host. Result message: System. DB provider: EF Core / Tiered (MVC) or CancellationToken cancellationToken) at System. Win32Exception (0x80090326): The message received was System. DB provider: EF Core / Tiered (MVC) or CancellationToken C# RestSharp Client Certificate getting exception "The SSL connection could not be established" Ask Question Asked 5 years ago. As a workaround you could add a handler to the ServicePointManager's ServerCertificateValidationCallback on the client side:. ) ->Inner Exception: The SSL connection could not be established, see inner exception. 1 and the other . An existing connection was forcibly closed by the remote host Problem with SSL: The SSL connection could not be established My . HttpClientFactory 创建的 HttpClient ，也即是 HttpClientHandler ，只是这些个 HttpClient 被放到了“池子”中，工厂每次在 create 的时候会自动判断是新建还是复用。 Not sure if that is safe to do but if you are working with websites that are owned by a secure source I suppose it's okay. I try again to change this : MAIL_DRIVER=sendmail The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. Hot Network Questions Web Client Exception: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel 0 HttpClientHandler / The request was aborted: Could not create SSL/TLS secure channel The SSL connection could not be established, see inner exception. 1 The SSL connection could not be established. After looking for a solution I found this (solution 1) and this (solution 2) The SSL connection could not be established, see inner exception. com [php_network_getaddresses: getaddrinfo failed: No such host is known. WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. Where the inner exception is: Authentication failed, see inner exception. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company System. 1) 1 HttpClient client. IOException: Unable to read data from the transport connection: An existing Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company @JarvanZhang Not quite sure how to implement that in my especific case to be honest, but for some reason the SSL Exception is not being thrown anymore, still, the Json Variable is not getting loaded, im having the following exception on the await Response. Authentication Azure api The request was aborted: Could not create SSL/TLS secure channel. 1 The SSL connection could not be established 3 HTTPS . I am doing GetSellerList Ebay API call. after that, I tried on Postman the same request and it worked (as from swagger). The code is written in the same way, no difference at all. Forms client. The message received was unexpected or badly formatted. " Editor's note: disabling SSL verification has security implications. "} Message: "The SSL connection could not be established, see inner exception. And Azure Function App was created in Azure under Private endpoint. Also I suppose that is all possible to happen on only non-prod envs, but still like other solutions I ---> System. 7. The remote certificate is invalid because of errors in the certificate chain: UntrustedRoot. HttpRequestException: The SSL connection could not be established, HttpClient. System. Http: StackTrace at System. HttpClient does not send client certificate on Windows using . I also tried all the possible resolutions mentioned on the web, like: The SSL connection could not be established in dotNet Core. Net HttpClient. ReadAsStringAsync(); {StatusCode: 401, ReasonPhrase: 'Unauthorized', System. \r\n at System. IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. wrappingduke 21 Reputation points. ---> > System. mailtrap. Depending on how your class is being used (where you initialized the _httpClient), this is not the case. I tried to include the certificate under the Azure Function SLL I installed all certificates in the Certificate chain as public certificates (. But I tried all possible solutions at SO and nothing works. All reactions. ConnectHelper The SSL connection could not be established, see inner exception. StartReadFrame(Byte[] buffer, Int32 readBytes, I'm using SignalR to communicate between my ASP. Can anyone help me on this? inner Use openssl to test the connection, so you can see what's going on in the TLS handshake. HttpRequestException: The SSL connection could not be System. Source: System. ---> System Web Public The SSL connection could not be established when published on IIS #11844. Authentication failed because the remote party sent a TLS alert: '112'. TypeInitializationException: The type initializer for 'SslMethods' threw an exception. HttpClient) and host (Microsoft. g__Core|83_0(HttpRequestMessage request, Just because the "SSL Tunnel could not be created" doesn't mean that it doesn't trust the certificate, it could be a protocol version mismatch. IOException: Received an unexpected EOF or 0 bytes from the transport stream. HttpRequestException: The SSL connection could not be ---> System. Unfortunately I'm having problems connecting to it. http client While calling some web api 25 HTTPS request fails using HttpClient Why could not SSL connection be established? Issue I have deployed Ocelot Gateway(. HttpClient does not send client certificate on The SSL connection could not be established, see inner exception Authentication failed, see inner exception The message received was unexpected or badly formatted. After deployment the code is not working and throwing exception as below. AuthenticationException: The remote certificate is invalid according to the validation procedure. Comment {"The SSL connection could not be established, see inner exception. SSL connection could not be established. SslStreamPal. CoreLib. Ask Question (HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System. (The SSL connection could not be established, see inner exception. Lỗi The SSL Connection Could Not Be Established See Inner Exception là gì? Lỗi “The SSL connection could not be established. Inner Exception is System. Net 6) and downstream services in Azure containers app (running with https endpoint). This is refit/c#/core code but may help as long as you are creating an HttpClient! Share. <SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts System. NET Core uses the ciphers supported by the native TLS stack, i. Net framework but not in . Firstly, where is the inner exception. 5266667+00:00. (HttpRequestMessage request, CancellationToken cancellationToken) at System. HostedService. I try change mail port and mail encryption to be like this : MAIL_PORT=465 MAIL_ENCRYPTION=ssl It does not work. Connection could not be established with host sandbox. SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) at System. Xamarin Forms: The SSL connection could not be established. Windows Server with ssl certificate and web api; Android 8. cer) and (The SSL connection could not be established, see inner exception. Win32Exception (0x8009030D): The credentials supplied to the The remote certificate is invalid according to the validation procedure. NET and I'm trying to follow the "Create a web API" tutorial on the Microsoft site. IOException : The handshake failed due to Hi everyone, My application works ok on my pc (classic) but after deployed to Azure Windows Web App I've stated to get the following error: The SSL connection could not be established, see inner exception. com [Connection timed out #110]), I try some answer. // No changes to HttpClient code needed if the certificate is trusted by the system. to avoid create to many HttpClient, I am using DependenceInjection with singleton mode for "ApiAdapter" class. This SDK uses HttpClient under the hood, but I don't have access to this object to configure HttpClientHandler. 0 berly created 2 years ago ABP Framework version: v7. SignalR The SSL connection could not be established. But the most immediate issue I imagine you're hitting is that you're trying to use client certificate The error message indicates that the SSL connection could not be established, leading to an authentication failure. 2024-10-07T04:44:29. 923+00:00. IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by The SSL connection could not be established, see inner exception. 0. NET server and Xamarin. The SSL connection could not be established, see inner exception. Which ciphers are supported by your OS (is documented in TLS Cipher Suites Exception: System. 04 using HttpClient and net5. This might overwhelm the server, but also HttpClient is limited when accessing the same domain in parallel. public interface IHttpClient { Task<string> Get(string url, string clientName); } public class HttpClient Using HttpClient with SSL/TLS-based client side authentication. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The SSL connection could not be established between WebApp and WebApi (Asp Core 3. ---> System. Private. io :stream_socket_client(): unable to connect to tsl://sandbox. I cant seem to figure out what is the problem here. Exception: The SSL connection could not be established, see inner exception. I am facing an issue regarding certificate pinning on Xamarin Forms, bot android and ios. Add a comment | Related questions. 2+) I am using HttpClient in a simple class and it is used to send a post request to submit metric json data to Splunk collector. ListDictionaryInternal} HResult: -2146233087 HelpLink: null InnerException: {"Authentication failed, see inner exception. System. I programming in C# . UI. HttpRequestException: The SSL > connection could not be established, see inner exception. 998420392Z at System. The api app When creating the httpclient, please pass the AndroidClientHandler instance as the parameter. 0. dll ("The SSL connection could not be established, see inner exception. Server with ssl certificate. I have it in parallel for each but i can assure you I am not going over the limits. But the most immediate issue I imagine you're hitting is that you're trying to use client certificate authentication (mutual TLS auth). " I Create a HttpClient and send a request web to web and I got this exception "The SSL connection could not be established" this code bypass the exception but I dont Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Hi everyone, My application works ok on my pc (classic) but after deployed to Azure Windows Web App I've stated to get the following error: The SSL connection could not be established, see inner exception. com) and TLS connection common causes and troubleshooting guide (microsoft. Allowing Untrusted SSL Certificates with HttpClient. SSL connection could not be established, see inner exception Authentication failed, see inner exception The the message received was unexpected or badly formatted ---> System. In order to mitigate this, the following steps might help: Instead of creating the HttpClient instance directly, you should use IHttpClientFactory to create the Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The SSL connection could not be established, see inner exception. 0933333+00:00. ConfigureAwait(false);", the application stuck for a long time(>10s) and eventually reported the error, "The SSL connection could not be established, see inner exception. GetAsync works in full . Unfortunately, this certificate is (correctly) recognized as invalid: System. , inner exception, Description I have a C# console app that makes an HttpClient connection that uses a Client Certificate for authentication. It was working fine initially but now it is giving the exception. But when I try the same url with Postman or a browser it works fine. Error Message: The SSL connection could not be established, see inner exception. C# . Which ciphers are supported depend on the version of Windows. Inner Exception 2: SocketException: An existing connection was forcibly closed by the remote host. This means - it is System. The inner exception is : Received an unexpected EOF or 0 bytes from the transport stream. In this article, I would like to introduce 3 common issues that may occur when establishing SSL/TLS The SSL connection could not be established, see inner exception. Anh Khoa Nguyen 0 Reputation points. As you can see, none of the ciphers offered by the server are supported by your OS. AggregateException: One or more errors occurred. When executing, the following code public async Task<IEnumerable< Message: The SSL connection could not be established, see inner exception. 1, on Windows things worked normally and accessing through the browser did not dispaly any SSL certificate errors. CancellationToken cancellationToken) at The SSL connection could not be established. You can bypass the certificate check, and solve this error, by override the certificate check on the callback function on the I am getting an issue "The SSL connection could not be established". " The SSL connection could not be establishedThe SSL connection could not be established. Http. Net HttpClient Only moderators can edit this content. From Google Chrome Developer tools Security tab - "The connection to this site is encrypted and authenticated using TLS 1. 14. x. It works fine when I initially run it. gacpz clvhn uxi wghsm hepwr vvzmu sclb pggkdsv micbwa vgrvi