What version of TLS does my C# program use?

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I develop a C# program in Visual Studio 2013 which communicates with a SOAP webservice. How can I tell which version of TLS my program uses?

I got the answer by directing my program to make requests to https://www.howsmyssl.com/a/check.

Transport Layer Security (TLS) best practices with the .NET Framework, .NET Framework applications should use the TLS version the operating system If an application is explicitly configured with SslProtocols. How to enable TLS 1.2 on clients. 12/13/2019; 4 minutes to read; In this article. Applies to: Configuration Manager (Current Branch) When enabling TLS 1.2 for your Configuration Manager environment, start by ensuring the clients are capable and properly configured to use TLS 1.2 before enabling TLS 1.2 and disabling the older protocols on the site servers and remote site systems.

TLS 1.2 was added in .NET 4.5. The earliest supported .NET version is 4.5.2, so you won't have any issues if you use a supported version.

.NET 4.6 uses TLS 1.2 by default. Earlier versions need this line to enable it :

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

TLS 1.0 is being phased out and SSL v3 is considered broken so they shouldn't be added.

Determine what version of #TLS your code is using., fully secure. The thing is - HTTPS comes in a few different "Flavours", or specifically TLS versions. If you connect to a HTTPS service, but use an old TLS version, then you're not being as secure as… If you make a call from C#, you may see a result like this NET application with removable features. As most servers are moving toward TLS 1.3 and removing TLS 1.0/1.1 support, examples of legacy .NET applications – compiled with an old version of the .NET Framework, like 4.0 or 4.5 – experiencing connectivity issues with TLS 1.2 servers are becoming more and more common, specially since installing a more recent version of the .NET

Another good way to check is to install WireShark (https://www.wireshark.org/download.html)

and to use it while running your application. within the TLS Packets you will be able to see versions and such:

Example for Wireshark View Of TLS traffic...

Forcing an old .NET application to support TLS 1.2 without , NET Framework is not sufficient: it's the version used for compiling your project that actually matters when it comes to selecting the supported TLS� TLS 1.3 is the latest version of the TLS protocol. TLS, which is used by HTTPS and other network protocols for encryption , is the modern version of SSL . TLS 1.3 dropped support for older, less secure cryptographic features, and it sped up TLS handshakes , among other improvements.

TLS 1.2 and .NET Support: How to Avoid Connection Errors, In this framework version TLS 1.2 is a default cryptographic standard. But what if you can't upgrade your application to latest .NET framework and� Don't use 4.6 to begin with, don't try to hard-code the versions. Simply googling for .NET TLS 1.2 returns Transport Layer Security (TLS) best practices with the .NET Framework as the first result. Use .NET 4.7 on a supported OS and let your application use the best available TLS version. Even 4.6.2 was a bit of a mess both on TLS and assembly

Enabling TLS 1.2 in your .NET framework applications, Our application connects to a web service to get some data and that no longer version is 4.6.2 and by default the runtime should default to TLS 1.2. I was able to reproduce with a demo C++ and C# application that uses a . Decide what version to use. Not all browser versions support TLS 1.2 and above. Depending on your particular business situation, this may present some limitations in using stronger encryption standards. Consider using TLS 1.0 or 1.1 for sites with a broad user base, particularly non-transactional sites. This way, you minimize the possibility

Enabling TLS 1.2 on your .NET application, This is what actually matters when it comes to selecting the supported TLS version during the TLS handshake. In this article I will describe the� I disabled TLS versions 1.0 and 1.1 and put the SSL settings to modern on my plesk server but cdn77.com tls test shows them still enabled. Also the nmap test shows them. I run Plesk Obsidian 18.0.27 Update #1 on Centos 7.

Comments
  • Wouldn't that be determined by the web server? Why do you need to know?
  • Check ServicePointManager.SecurityProtocol value for the supported protocols.
  • Just enable everything on ServicePointManager.SecurityProtocol and you're good to go, right?
  • @MickyD the server will refuse the connection if the runtime doesn't support 1.2.
  • @rene a couple of years ago several large service providers (think airlines) dropped even TLS1.1. A lot of companies had to scramble to upgrade to .NET 4.5.2
  • I like to test the behaviour of my program, not just to rely on the documentation.
  • I don't understand the disdain for this answer. It uses empirical testing and it can be generalized to other server types.
  • Can you link to a source confirming that .NET 4.6 uses TLS 1.2 by default? I can't find anything official and can see other commentors contradicting this e.g: stackoverflow.com/a/47913910/5344430
  • Don't use 4.6 to begin with, don't try to hard-code the versions. Simply googling for .NET TLS 1.2 returns Transport Layer Security (TLS) best practices with the .NET Framework as the first result. Use .NET 4.7 on a supported OS and let your application use the best available TLS version. Even 4.6.2 was a bit of a mess both on TLS and assembly redirects.
  • I'm not going to use 4.6. I literally just want to know where you got the information "4.6 uses TLS 1.2 by default" because I couldn't find it anywhere. How did you confirm / prove that?
  • I posted the link already. 3 years ago I was answering the question How can I tell which version of TLS my program uses? and the answer isn't VS 2013. To get TLS 1.2 without code modifications you need 4.6 at least. By that point I had answered that question dozens of times for years and didn't bother posting another full explanation. By that point (like many common questions in SO) just finding a good duplicate would take more time than writing a quick answer
  • @alksdjg and, the real question after all was posted as a comment to Oria's answer As my production web service calls were communicating with a 3rd party service, I needed an extra proof of which protocol was being used before and after I made the .net version change.
  • There's no reason to. There's no ambiguity. 4.6 -> TLS1.2 by default 4.5 -> TLS11 and config change for 1.2. 4 and below, no TLS 1.2
  • 4 and below support TLS 1.2 with a hotfix.