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sslhttpwebrequesttls1.3

How to handle HttpWebRequest C# with Tls 1.3

I am unable to connect to an HTTPS server (TLS 1.3) using WebRequest because of this error message:

The request was aborted: Could not create SSL/TLS secure channel.

The previous TLS version was 1.2 and with below code I could GET the page properly but as the page ssl upgraded to TLS 1.3 I got the error and also I cannot find any solution about it:

ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

In fact, I think it should be something like below:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls13;

but there is not.

Solution

  • It looks like TLS13 is supported now as part of the 4.8 .Net Framework

    https://learn.microsoft.com/en-us/dotnet/api/system.net.securityprotocoltype?view=netframework-4.8

    However it is only supported on newer Window's OS versions (windows 11 and server 2022+), see here for full support details.