Could not create SSL/TLS secure channel, despite setting ServerCertificateValidationCallback

Could not create SSL/TLS secure channel, despite setting ServerCertificateValidationCallback

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vb .net the request was aborted: could not create ssl/tls secure channel

I'm trying to establish SSL/TLS connection to test server with self-signed certificate. Communication through unsecure channel worked without issues.

Here is my sample code, which I've written based on this solutions: Allowing Untrusted SSL Certificates with HttpClient C# Ignore certificate errors? .NET client connecting to ssl Web API

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

var c = new HttpClient();
var r = c.GetAsync("https://10.3.0.1:8443/rest/v1").Result;
if (r.IsSuccessStatusCode)
{
    Log.AddMessage(r.Content.Get<string>());
}
else
{
    Log.AddMessage(string.Format("{0} ({1})", (int)r.StatusCode, r.ReasonPhrase));
}

also tried this:

var handler = new WebRequestHandler();
handler.ServerCertificateValidationCallback = delegate { return true; };
var c = new HttpClient(handler);
...

and this

ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

but each time I've got an exception:

InnerException: System.Net.Http.HttpRequestException
   _HResult=-2146233088
   _message=An error occurred while sending the request.
   HResult=-2146233088
   IsTransient=false
   Message=An error occurred while sending the request.
   InnerException: System.Net.WebException
        _HResult=-2146233079
        _message=The request was aborted: Could not create SSL/TLS secure channel.
        HResult=-2146233079
        IsTransient=false
        Message=The request was aborted: Could not create SSL/TLS secure channel.
        Source=System
        StackTrace:
             at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
             at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
        InnerException: 

What do I do wrong? Why I can't connect to this server (which has invalid-self-signed certificate)


You are doing it right with ServerCertificateValidationCallback. This is not the problem you are facing. The problem you are facing is most likely the version of SSL/TLS protocol.

For example, if your server offers only SSLv3 and TLSv10 and your client needs TLSv12 then you will receive this error message. What you need to do is to make sure that both client and server have a common protocol version supported.

When I need a client that is able to connect to as many servers as possible (rather than to be as secure as possible) I use this (together with setting the validation callback):

  ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

Solved: Could not create SSL/TLS secure channel / C# VMORC , Although our websites currently do not have a mechanism to recognize the various Could not create SSL/TLS secure channel / C# VMORC call We tried all combinations of ServicePointManager in order to test the connection settings: ServicePointManager.ServerCertificateValidationCallback += new  Re: Could not create SSL/TLS secure channel / C# VMORC call I had the same issue, My "myProject_keyAndCertBundle.p12" had working right on Soap UI, but it was not working on Visual Studio 2019, but now it is working Right.


We have been solving the same problem just today, and all you need to do is to increase the runtime version of .NET

4.5.2 didn't work for us with the above problem, while 4.6.1 was OK

If you need to keep the .NET version, then set

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

Could not create ssl/tls secure channel · Issue #1127 · restsharp , error message: Could not create ssl/tls secure channel ServerCertificateValidationCallback = delegate { return true; }; System. If I'm trying to access an https API should I do some extra configuration on the RestClient? Even though this is not a RestSharp issue, RestSharp could have a mechanism to  Below is the code. I have verified that the certificate passed to this call is correct. The code executes the "uh oh" try with the exception "The request was aborted: Could not create SSL/TLS secure channel"


Just as a follow up for anyone still running into this – I had added the ServicePointManager.SecurityProfile options as noted in the solution:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

And yet I continued to get the same "The request was aborted: Could not create SSL/TLS secure channel" error. I was attempting to connect to some older voice servers with HTTPS SOAP API interfaces (i.e. voice mail, IP phone systems etc… installed years ago). These only support SSL3 connections as they were last updated years ago.

One would think including SSl3 in the list of SecurityProtocols would do the trick here, but it didn’t. The only way I could force the connection was to include ONLY the Ssl3 protocol and no others:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

Then the connection goes through – seems like a bug to me but this didn’t start throwing errors until recently on tools I provide for these servers that have been out there for years – I believe Microsoft has started rolling out system changes that have updated this behavior to force TLS connections unless there is no other alternative.

Anyway – if you’re still running into this against some old sites/servers, it’s worth giving it a try.

Could not create SSL/TLS secure channel, despite setting , Could not create SSL/TLS secure channel, despite setting ServerCertificateValidationCallback. I'm trying to establish SSL/TLS connection to test server with  Re: The request was aborted: Could not create SSL/TLS secure channel Hi Ackerly Xu, I've changed order, set the tls/ssl settings first but I still get the same response


move this line: ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

Before this line: HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);

Original post: KB4344167 security update breaks TLS Code

The request was aborted: Could not create SSL/TLS secure channel , The request was aborted: Could not create SSL/TLS secure channel ServicePointManager.ServerCertificateValidationCallback += new The best solution is to use the SChannel troubleshooting tools set. SChannel is IISCrypto is a great tool to use for this (even for client PCs, despite the "IIS" name)​. The request was aborted: Could not create SSL/TLS secure channel. Here in this blog post, I will explain how I troubleshot to identify root cause of this exception and its possible solution. Looking at the exception, it is clear that issue is due to SSL certificate and for some reason, server is unable to connect this particular website with HTTPS.


In my case TLS1_2 was enabled both on client and server but the server was using MD5 while client disabled it. So, test both client and server on http://ssllabs.com or test using openssl/s_client to see what's happening. Also, check the selected cipher using Wireshark.

The request was aborted: Could not create SSL/TLS secure channel, But I cannot run it as a console application. try with the exception "The request was aborted: Could not create SSL/TLS secure channel" Also, although you've set ServerCertificateValidationCallback to always validate the  "Invoke-WebRequest : The request was aborted: Could not create SSL/TLS secure channel." https requests appear to work ("https://google.com") but not this one in question. How can I get this to work or use other powershell command to read the page contents?


[Solved] Could not create SSL/TLS secure channel, I think i found the solution : TLS 1.2 and .NET Support: How to Avoid Connection Errors - Perficient Blogs[^]. Hide Copy Code. //in .NET 4.0, TLS  The request was aborted: Could not create SSL/TLS secure channel. Just visiting the page myself, running openssl s_client -connect ir.netflix.com:443 -tls1_2, or going over the SSL Labs analysis summary suggest that the server is running proper TLS 1.2. HttpWebRequest does seem to work for TLS 1.2 some of the time (as suggested here),


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Could not create SSL/TLS secure channel error when both client , Could not create SSL/TLS secure channel error when both client and server support TLS 1.2 SSL/TLS secure channel error . From code I set, ServerCertificateValidationCallback = delegate { return true; };. I am getting the  Home IIS.NET Forums IIS 7 and Above Security Could not create SSL/TLS secure channel Could not create SSL/TLS secure channel RSS 4 replies