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  1. POWebClient + HTTPS Issues
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    <p>I am currently integrating with a system created by a 3rd party. This system requires me to send a request using XML/HTTPS. The 3rd party send me the certificate and I installed it</p> <p>I use the following code:</p> <pre><code>using (WebClient client = new WebClient()) { client.Headers.Add(HttpRequestHeader.ContentType, "text/xml"); System.Text.ASCIIEncoding encoding=new System.Text.ASCIIEncoding(); var response = client.UploadData(address, "POST", encoding.GetBytes(msg)); } </code></pre> <p>This code returns the following <code>WebException</code>:</p> <blockquote> <p>The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.</p> </blockquote> <p><strong>UPDATE</strong> Because it's a test server I am working against, the certificate isn't trusted and validation fails... To bypass this in test/debug environment, create a new <code>ServerCertificateValidationCallback</code></p> <pre><code>ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback(bypassAllCertificateStuff); </code></pre> <p>and here is my "fake" callback</p> <pre><code>private static bool bypassAllCertificateStuff(object sender, X509Certificate cert, X509Chain chain, System.Net.Security.SslPolicyErrors error) { return true; } </code></pre> <p>Read more <a href="http://developers.de/blogs/damir_dobric/archive/2006/06/29/585.aspx" rel="noreferrer">here</a> and <a href="http://msdn.microsoft.com/en-us/library/system.net.servicepointmanager.servercertificatevalidationcallback.aspx" rel="noreferrer">here</a></p>
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