bypass invalid SSL certificate in .net core

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I am working on a project that needs to connect to an https site. Every time I connect, my code throws exception because the certificate of that site comes from untrusted site. Is there a way to bypass certificate check in .net core http?

I saw this code from previous version of .NET. I guess I just need something like this.

 ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;

ServicePointManager.ServerCertificateValidationCallback isn't supported in .Net Core.

Current situation is that it will be a a new ServerCertificateCustomValidationCallback method for the upcoming 4.1.* System.Net.Http contract (HttpClient). .NET Core team are finalizing the 4.1 contract now. You can read about this in here on github

You can try out the pre-release version of System.Net.Http 4.1 by using the sources directly here in CoreFx or on the MYGET feed:

Current WinHttpHandler.ServerCertificateCustomValidationCallback definition on Github

Ignoring SSL Certificate Errors On .NET Core On HttpClient, Errors On .NET Core On HttpClient. Written by William Roush on December 20, 2016 at 8:28 pm. Had a certificate  Possible duplicate of bypass invalid SSL certificate in .net core – thmshd Mar 10 '17 at 7:47 2 Thanks for all the pointers to other threads - but having visited all of them in the past I still have a problem - none of them will compile.


As mentioned below, not all implementations support this callback (i.e. platforms like iOS). In this case, as the docs say, you can set the validator explicitly:

handler.ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator;

This works too for .NET Core 2.2, 3.0 and 3.1

Old answer, with more control but may throw PlatformNotSupportedException:

You can override SSL cert check on a HTTP call with the a anonymous callback function like this

using (var httpClientHandler = new HttpClientHandler())
   httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; };
   using (var client = new HttpClient(httpClientHandler))
       // Make your request...

Additionally, I suggest to use a factory pattern for HttpClient because it is a shared object that might no be disposed immediately and therefore connections will stay open.

Ignore HTTPS issues with HTTPClient in .NET core, The api is using a self-signed certificate to make it work over https. This would generate some https/ssl  If renewal does not happen on time, SSL certificate becomes invalid..NET has by default build in mechanism to throw an exception if you are trying to make a WebRequest to HTTPS endpoint which has invalid SSL certificate. In other words, .NET is doin SSL certificate validation for you under the hood.

Came here looking for an answer to the same problem, but I'm using WCF for NET Core. If you're in the same boat, use:

client.ClientCredentials.ServiceCertificate.SslCertificateAuthentication = 
    new X509ServiceCertificateAuthentication()
        CertificateValidationMode = X509CertificateValidationMode.None,
        RevocationMode = X509RevocationMode.NoCheck

Disable Certificate Validation Check .net core 2+ · Issue #3324 , net core and since my server has weak/old certs I try to disable the certificate check. I tried to use: factory. 2 thoughts on “ Ignoring SSL Certificate Errors On .NET Core On HttpClient ” Peter Mills October 10, 2018 at 8:56 am. Thank you for writing this, I have been searching for how to do this all day for our development environment, as the old .Net way of doing it doesn’t work anymore.

I solve with this:


public void ConfigureServices(IServiceCollection services)
        services.AddHttpClient("HttpClientWithSSLUntrusted").ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler
            ClientCertificateOptions = ClientCertificateOption.Manual,
            ServerCertificateCustomValidationCallback =
            (httpRequestMessage, cert, cetChain, policyErrors) =>
                return true;


public UserService(IHttpClientFactory clientFactory, IOptions<AppSettings> appSettings)
        _appSettings = appSettings.Value;
        _clientFactory = clientFactory;

var request = new HttpRequestMessage(...

var client = _clientFactory.CreateClient("HttpClientWithSSLUntrusted");

HttpResponseMessage response = await client.SendAsync(request);

Downstream skip SSL/certificate validation per configuration · Issue , Im still a bit confused with the use of dotnet core on linux and cURL to handle HttpClient requests. To not be #309 allow users to ignore ssl warnings, not sure this is advisable #325. C# Ignore certificate errors? Ask Question Asked 10 years, 2 months ago. Active 21 days ago. Viewed 204k times bypass invalid SSL certificate in .net core. 73.

In .NetCore, you can add the following code snippet at services configure method , I added a check to make sure only that we by pass the SSL certificate in development environment only

services.AddHttpClient("HttpClientName", client => {
// code to configure headers etc..
}).ConfigurePrimaryHttpMessageHandler(() => {
                  var handler = new HttpClientHandler();
                  if (hostingEnvironment.IsDevelopment())
                      handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; };
                  return handler;

Bypass SSL certificate validation, This exception is caused by invalid or expired SSL certificate. As soon as SSL certificate is expired,  Double-click the SSL Settings option in the Features View window. Check the Require SSL checkbox, and select the Require radio button in the Client certificates section. Azure and custom web proxies. See the host and deploy documentation for how to configure the certificate forwarding middleware. Use certificate authentication in Azure Web Apps

How to ignore SSL errors on .net core on OS X? : csharp, for testing local i don't have a valid ssl cert and for gods sake, I can't get it running thanks to this stupid curl version of OSX  Allowing Untrusted SSL Certificates with HttpClient. bypass invalid SSL certificate in .net core. 73. Accepting invalid SSL certificates using WinRT. 162.

Configure certificate authentication in ASP.NET Core, If the app is using self-signed certificates, this option needs to be set to CertificateTypes.All or  The .NET Core SDK includes an HTTPS development certificate. The certificate is installed as part of the first-run experience. For example, dotnet --info produces a variation of the following output: ASP.NET Core ----- Successfully installed the ASP.NET Core HTTPS Development Certificate. To trust the certificate run 'dotnet dev-certs https

Ignore ssl certificate errors in xamarin & .Net core, NET Core / ServerCertificateValidationCallback is not called anymore on Android​. xamarin logo and SSL. Set Powershell to skip SSL certificate checks NOTE: This is NOT a recommended practice! You should have valid certificates and CA Servers! If you are trying to query a web site and you have invalid SSL certificates, Powershell is by default very strict on what it accepts.

  • Possible duplicate of Allowing Untrusted SSL Certificates with HttpClient
  • This only works on Windows. Do you have a solution for Linux? Thanks.
  • I am using .Net Core 1.0 and this worked for me. As a heads up it looks like .Net Core 2.0 has added an HttpClient property called DangerousAcceptAnyServerCertificateValidator which provides a way to make this work on MacOSX. More info here -
  • Using this with AWS Lambda, .NET Core 1.0 corrected what was preventing me from connecting to an internal HTTPS with a custom root CA cert.
  • Any factory pattern for HttpClient ?
  • @Kiquenet Just create a factory, where the GetHttpClient Method returns the configured HttpClient and use it within a using-block.
  • This should be the accepted answer, especially since it can be scoped to a single client use.
  • Global for all certificates and AppDomain ?
  • @Kiquenet: I believe so, yes. Check for an updated answer elsewhere, there might be a better solution now. It's been a year. I guess you could subclass the authenticator if nothing else. And no, there is no native factory for HttpClient that I know off. If you need more functionality, look at RestClient.
  • Thank you! You saved my day!
  • Upvoted. Thank you.
  • Why the -ve, this is exactly implementing what others suggested in code and they scored points on it , i am just illustrating the same implementation in .netCore code
  • probably. because it lacks any explanation whatsoever. why this approach should be take over any other, What code should be written in calling section (say mycontroller.cs), which could be part of explanation. any official documentation/citation.
  • As I said if you reviewed other comments at the top of the thread there is no much difference and yet they scored 18 and 81 points ,
  • because they have added text supporting their answers, please read the guidelines once more. Might help you, @moderators can point to the exact problems IMHO.