In DotNetBrowser 1.7 the Certificate Validation API has been introduced. Using this API you can get information about each SSL certificate used for displaying HTTPS web pages and decide whether it should be accepted or rejected. By default, Chromium engine decides whether certificate should be accepted/rejected. You can register your own CertificateVerifier implementation to modify default behavior. For example:

C#

using DotNetBrowser;
using DotNetBrowser.WPF;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;

namespace CertificateVerifierSample
{
    /// <summary>
    /// The sample demonstrates how to accept/reject SSL certificates using
    /// custom SSL certificate verifier.
    /// </summary>
    public class WindowMain : Window
    {
        private WPFBrowserView browserView;

        class TestCertificateVerifier : CertificateVerifier
        {
            public CertificateVerifyResult Verify(CertificateVerifyParams parameters)
            {
                // Reject SSL certificate for all "google.com" hosts.
                if (parameters.HostName.Contains("google.com"))
                {
                    return CertificateVerifyResult.INVALID;
                }
                return CertificateVerifyResult.OK;

            }
        }
        public WindowMain()
        {
            BrowserContext browserContext = BrowserContext.DefaultContext;
            Browser browser = BrowserFactory.Create(browserContext);

            //add custom request handler
            browser.Context.NetworkService.CertificateVerifier = new TestCertificateVerifier();

            browserView = new WPFBrowserView(browser);
            Content = browserView;

            Width = 1024;
            Height = 768;
            this.Loaded += WindowMain_Loaded;
        }

        void WindowMain_Loaded(object sender, RoutedEventArgs e)
        {
            browserView.Browser.LoadURL("http://google.com");
        }

        [STAThread]
        public static void Main()
        {
            Application app = new Application();

            WindowMain wnd = new WindowMain();
            app.Run(wnd);

            var browser = wnd.browserView.Browser;
            wnd.browserView.Dispose();
            browser.Dispose();
        }
    }
}

VB.NET

Imports DotNetBrowser
Imports DotNetBrowser.WPF
Imports System.Windows

Module CertificateVerifierSample

    ''' <summary>
    ''' The sample demonstrates how to accept/reject SSL certificates using
    ''' custom SSL certificate verifier.
    ''' </summary>
    Public Class WindowMain
        Inherits Window

        Private browserView As WPFBrowserView

        Class TestCertificateVerifier
            Implements CertificateVerifier

            Public Function Verify(ByVal parameters As CertificateVerifyParams) As CertificateVerifyResult _
                Implements CertificateVerifier.Verify
                'Reject SSL certificate for all "google.com" hosts.
                If parameters.HostName.Contains("google.com") Then
                    Return CertificateVerifyResult.INVALID
                End If

                Return CertificateVerifyResult.OK
            End Function
        End Class

        Public Sub New()
            Dim browserContext As BrowserContext = BrowserContext.DefaultContext
            Dim browser As Browser = BrowserFactory.Create(browserContext)

            'add custom request handler
            browser.Context.NetworkService.CertificateVerifier = New TestCertificateVerifier()
            browserView = New WPFBrowserView(browser)
            Content = browserView

            Width = 1024
            Height = 768
            AddHandler Me.Loaded, AddressOf WindowMain_Loaded
        End Sub

        Private Sub WindowMain_Loaded(ByVal sender As Object, ByVal e As RoutedEventArgs)
            browserView.Browser.LoadURL("http://google.com")
        End Sub

        <STAThread>
        Public Shared Sub Main()
            Dim app As Application = New Application()
            Dim wnd As WindowMain = New WindowMain()
            app.Run(wnd)
            Dim browser = wnd.browserView.Browser
            wnd.browserView.Dispose()
            browser.Dispose()
        End Sub
    End Class
End Module