C# Ignore Certificate Errors

C# Ignore certificate errors?

Add a certificate validation handler. Returning true will allow ignoring the validation error:

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

How to ignore the certificate check when ssl

Since there is only one global ServicePointManager, setting ServicePointManager.ServerCertificateValidationCallback will yield the result that all subsequent requests will inherit this policy. Since it is a global "setting" it would be prefered to set it in the Application_Start method in Global.asax.

Setting the callback overrides the default behaviour and you can yourself create a custom validation routine.

Ignore self signed certificate errors c# UWP

Firstly, I should point out that please be careful to ignore Self Certificate Errors since there may be some dangers to do this.

You can try to use the HttpBaseProtocolFilter.IgnorableServerCertificateErrors Property to do that. You can get the details about how to use it from the following blog and sample:

https://blogs.msdn.microsoft.com/wsdevsol/2013/10/17/how-to-ignore-self-signed-certificate-errors-in-windows-store-apps-8-1/

https://code.msdn.microsoft.com/windowsapps/How-to-ignore-Self-Signed-e50b89b6

In addition, since version 16299, UWP app support .NET Standard 2.0, you can target your UWP app on or after version 16299 to try to use the ServicePointManager class.

Ignore WCF certificate errors in ASP.NET Core 3.1

You can refer to the following code to bypass certificate verification:

            BasicHttpsBinding binding = new BasicHttpsBinding();
            binding.Security.Mode = BasicHttpsSecurityMode.Transport;
            binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
            ChannelFactory<IService> factory = new ChannelFactory<IService>(binding, new EndpointAddress(uri));

            factory.Credentials.ServiceCertificate.SslCertificateAuthentication = new System.ServiceModel.Security.X509ServiceCertificateAuthentication()
            {
                CertificateValidationMode = System.ServiceModel.Security.X509CertificateValidationMode.None,
                RevocationMode = System.Security.Cryptography.X509Certificates.X509RevocationMode.NoCheck
            };

bypass invalid SSL certificate in .net core

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:
https://dotnet.myget.org/gallery/dotnet-core

Current WinHttpHandler.ServerCertificateCustomValidationCallback definition on Github

How can I disable the SSL Certificate check in the .NET Core http client?

TL; DR: The problem lied not within certificate validation, but in a security group rule.

1. As Marc Gravell kindly pointed out, the DangerousAcceptAnyServerCertificateValidator already achieves the aim of ignoring certificate validation problems.
2. After deploying the same code in an EC2 instance in the same VPC and subnet I noticed, that the .NET Core code was making one more HTTP call than the Go code (Although I still do not understand why). The IP adress was not within the allowed IP range of outgoing traffic, thus blocking the request and causing a timeout of the HttpClient.

---

Related Topics