Bypass invalid SSL certificate errors when calling web services in .Net

Solution 1:

Alternatively you can register a call back delegate which ignores the certification error:

...
ServicePointManager.ServerCertificateValidationCallback = MyCertHandler;
...

static bool MyCertHandler(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors error)
{
// Ignore errors
return true;
}

Solution 2:

Like Jason S's answer:

ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

I put this in my Main and look to my app.config and test if (ConfigurationManager.AppSettings["IgnoreSSLCertificates"] == "True") before calling that line of code.

Solution 3:

I solved it this way:

Call the following just before calling your ssl webservice that cause that error:

using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

/// <summary>
/// solution for exception
/// System.Net.WebException: 
/// The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.
/// </summary>
public static void BypassCertificateError()
{
    ServicePointManager.ServerCertificateValidationCallback +=

        delegate(
            Object sender1,
            X509Certificate certificate,
            X509Chain chain,
            SslPolicyErrors sslPolicyErrors)
        {
            return true;
        };
}