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POSSL Failures - Receiving SSL/TLS exception when using HttpWebRequest with client certificate
 

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  1. POSSL Failures - Receiving SSL/TLS exception when using HttpWebRequest with client certificate
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    <p>I have a Windows 2008 Server with IIS 7 which using a .NET C# Application to send requests to PayPal to process payments. A few months ago I installed a Certificate which was purchased by Verisign. After installation, I was able to run my WebClient code to create SSL Connections successfully, and process payments via the PayPal NVP API (Name Value Pair). </p> <p>Recently, I have been receiving an error during SSL Transaction. The specific error is as follows:</p> <p><strong>Could not create SSL/TLS secure channel</strong></p> <p>I've checked everything I could think of, and read many articles on StackOverflow and other places on the net.</p> <p>The best resource I found was this:</p> <p>The request was aborted: Could not create SSL/TLS secure channel</p> <p>Lookup the error in this article <a href="http://support.microsoft.com/kb/915599" rel="nofollow noreferrer">http://support.microsoft.com/kb/915599</a> Resolution J. It also may be that you are not supplying a client certificate. Most likely this is an issue with TLS or SSL3 being used and the server not understanding it.</p> <p><a href="http://blogs.msdn.com/b/jpsanders/archive/2009/01/07/you-receive-one-or-more-error-messages-when-you-try-to-make-an-http-request-in-an-application-that-is-built-on-the-net-framework-2-0.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/b/jpsanders/archive/2009/01/07/you-receive-one-or-more-error-messages-when-you-try-to-make-an-http-request-in-an-application-that-is-built-on-the-net-framework-2-0.aspx</a></p> <p>And here is a list of all the other resources I've tried reading and implimenting their solutions:</p> <p><strong>Various Links I've Tried:</strong></p> <p><a href="http://support.microsoft.com/kb/901183" rel="nofollow noreferrer">http://support.microsoft.com/kb/901183</a></p> <p><a href="https://stackoverflow.com/questions/1600743/could-not-create-ssl-tls-secure-channel-could-the-problem-be-a-proxy-server">Could not create SSL/TLS secure channel - Could the problem be a proxy server?</a></p> <p><a href="https://stackoverflow.com/questions/5353771/the-request-was-aborted-could-not-create-ssl-tls-secure-channel">The request was aborted: Could not create SSL/TLS secure channel</a></p> <p><a href="https://stackoverflow.com/questions/8692532/the-request-was-aborted-could-not-create-ssl-tls-secure-channel-decrypt-retur">The request was aborted: Could not create SSL/TLS secure channel - Decrypt returned SEC_I_RENEGOTIATE</a></p> <p><a href="http://social.msdn.microsoft.com/forums/en-US/netfxnetcom/thread/99d49286-5c3a-4311-a1e3-499f035ce979/" rel="nofollow noreferrer">http://social.msdn.microsoft.com/forums/en-US/netfxnetcom/thread/99d49286-5c3a-4311-a1e3-499f035ce979/</a></p> <p><a href="http://blogs.msdn.com/b/jpsanders/archive/2009/01/07/you-receive-one-or-more-error-messages-when-you-try-to-make-an-http-request-in-an-application-that-is-built-on-the-net-framework-2-0.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/b/jpsanders/archive/2009/01/07/you-receive-one-or-more-error-messages-when-you-try-to-make-an-http-request-in-an-application-that-is-built-on-the-net-framework-2-0.aspx</a></p> <p><a href="http://forums.iis.net/t/1156690.aspx" rel="nofollow noreferrer">http://forums.iis.net/t/1156690.aspx</a></p> <p><strong>I have tried the following solutions:</strong></p> <ol> <li>Reinstall the certificate, and placed it into various stores (Personal, LocalComputer)</li> <li><p>Added this ServiceManager code:</p> <pre><code>ServicePointManager.Expect100Continue = true; ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; </code></pre></li> <li><p>Enabled logging to gain more verbose details</p></li> <li>Various other solutions listed in the above links</li> </ol> <p>What is so frustrating is that this was working fine a few months ago, and now I receive this error. At first, I thought the cert expired, but it appears to be fine.</p> <p>It could be a Service Pack or Hotfix for Windows Server has created a new setting or scenario which breaks SSL. I figured that re-installing the cert would solve that. </p> <p>It is important to note that when I reinstalled, I simply added it to the various stores (Double Click the cert and install). I did not create a "Certificate Request". Since its already installed and bound to the SSL Port of my IIS Application, it should be ok.</p> <p><strong>This is the code that creates the web request:</strong> </p> <pre><code> public static Hashtable DoWebReq(string strNVP, string strNVPSandboxServer) { ServicePointManager.Expect100Continue = true; ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; string _strNVP = strNVP; //Create web request and web response objects, make sure you using the correct server (sandbox/live) var wrWebRequest = (HttpWebRequest)WebRequest.Create(strNVPSandboxServer); wrWebRequest.Method = "POST"; // POST var requestWriter = new StreamWriter(wrWebRequest.GetRequestStream()); requestWriter.Write(_strNVP); requestWriter.Close(); // Get the response. var hwrWebResponse = (HttpWebResponse)wrWebRequest.GetResponse(); var responseReader = new StreamReader(wrWebRequest.GetResponse().GetResponseStream()); //and read the response string responseData = responseReader.ReadToEnd(); responseReader.Close(); string result = System.Web.HttpContext.Current.Server.UrlDecode(responseData); string[] arrResult = result.Split('&amp;'); Hashtable htResponse = new Hashtable(); string[] responseItemArray; foreach (string responseItem in arrResult) { responseItemArray = responseItem.Split('='); htResponse.Add(responseItemArray[0], responseItemArray[1]); } return htResponse; } </code></pre> <p><strong>Here are a collection of screen shots to show the various components of the SSL Machine:</strong></p> <p>This is the SSL Binding Settings in IIS: <img src="https://i.stack.imgur.com/6f1ER.jpg" alt="SSL Bindings"></p> <p>Here is an overview of the installed Certs: <img src="https://i.stack.imgur.com/9NSBx.jpg" alt="certs1"></p> <p>This is the Error I receive: <img src="https://i.stack.imgur.com/qupnX.jpg" alt="SSL Error"></p> <p><img src="https://i.stack.imgur.com/KYAQ4.jpg" alt="certs2"></p> <p>Certs Installed: <img src="https://i.stack.imgur.com/P8TOA.jpg" alt="enter image description here"></p> <p>Certificate Details <img src="https://i.stack.imgur.com/SMaZ8.jpg" alt="enter image description here"></p> <p>Any advice on fixing this error would be most appreciated. Some possibilities I've considered but not addressed are:</p> <ol> <li>Could the request be taking too long? It seems fast enough... but I've read this could be a problem.</li> <li>In Internet Explorer, I do see the Green "SSL Bar" which shows this site is verified as being secure. This tells me the Cert is installed correctly, is this true?</li> <li>Is there a simple test I can perform with a HTTP request of some kind to help narrow down the source of the problem?</li> <li>Could this have anything to do with PayPal? Is it possible paypal is rejecting the request due to credentials on their end? </li> <li>Would implementing an <a href="https://msdn.microsoft.com/en-us/library/k8z4ffe4%28vs.71%29.aspx" rel="nofollow noreferrer">ICertificatePolicy Interface</a> be of any help in debugging the issue? I'm hoping I can just fix it.</li> </ol> <p>I would think that either the SSL would work or not, it has no bearing/dependency on PayPal at all... but I could be wrong.</p> <p>I feel like I should be able to just use the Name Value Pair URL which is built by the WebClient class, and send that over the pipe via IE and receive a response.</p>
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    1. CONot sure if you still need it - your question is very extensive :)(which is good, just hard to fast-read through it), hope I got it right. Anyway, I don't have the 'answer' but this might help - you might want to debug it using the validation callback - also you can validate manually (return true) see if that works (not a solution just to check, see what happens) - this is the code "ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback((s, ce, ch, ssl) => true);" - and look up "Using a self-signed certificate with .NET" on SO.
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    2. COAbout the best detailed question I have read on SO, +1
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      1. USAvada Kedavra
 

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