If you target 4.7.1 or above, the default is now SslProtocols.None which means you will get the OS default. Starting from 4.7.1, we made a change based on which version of the framework you are targeting. On 4.7 our behavior is not dependent on which version you target and we default to TLS1.2, TLS1.1 and TLS1.0 all being allowed. We have different behavior on 4.7 and 4.7.1.
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The section linked is talking about the WCF TCP transport (net.tcp) using certificate authentication (as opposed to windows authentication). This isn't not related to the TLS protocol used for HTTPS but is a different usage of the TLS protocol used by message security. In that scenario, we just use whatever value is set in ServicePointManager.SecurityProtocols as we didn't have a public class that we could expose an explicit property on. Sorry, I missed a couple of questions in this issue in your question here, the section you are quoting is about using certificate authentication when using message security. End of inner exception stack trace -Īt .ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)Īt .Request(Message message, TimeSpan timeout)Īt .Request(Message message, TimeSpan timeout)Īt .Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object ins, Object outs, TimeSpan timeout)Īt .InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)Īt .Invoke(IMessage message)Īt .RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)Īt .RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
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> : The request was aborted: Could not create SSL/TLS secure channel.Īt ()Īt `1.(TimeSpan timeout) : Could not establish secure channel for SSL/TLS with authority '.'. NET Framework applications targeting 4.7 and later, these registry keys are not needed and the equivalent "SystemDefault" values are used.
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The guidance given in our documentation is that for new code the recommendation is to use patterns such as SystemDefaultTlsVersions to let the OS make the best decision. See the matrix of OS versions TLS protocols here: For example, as the OS version moves forward in the future, TLS 1.3 will be added and other protocols will be removed. And this default set will change over time depending on the OS version. That means that the operating system will select the set of TLS protocols for the default set. Using SystemDefaultTlsVersions, on the other hand, causes the same ServicePointManager.SecurityProtocol property to use a default of SecurityProtocolType.SystemDefault. SchUseStrongCrypto will also set the default ServicePointManager.SecurityProtocol property to use "Tls1.0 | Tls 1.1 | Tls1.2" as the default. that are considered insecure such as RC4. SchUseStrongCrypto will always drop Ssl3.0 as well as any cipher suites from Tls1.0 et. The difference between those two registry entries is as follows. Assuming the server supported Tls1.2, the end result would be Tls1.2. And doing so implies that the strongest protocol (in this case Tls1.2) would be offered first to a server. Both of them will indeed add Tls1.1 and Tls1.2 to the set of possible protocols. The difference between SchUseStrongCrypto and SystemDefaultTlsVersions is subtle. Our understanding is also mentioned here.
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NET 4.0 - 4.6.2, the presence of SchUseStrongCrypto is the only entry, we require. The explanation of SystemDefaultTlsVersions in the same documents, only mentions the cases, when 4.7 is installed on the system.įor all other cases, where the machine has 4.5.2 to 4.6.2, but with apps targeting. The presence of SchUseStrongCrypto is good enough for any apps which are targeting. It is mentioned - Set the SchUseStrongCrypto and SystemDefaultTlsVersions registry keys to 1Īs per our tests with sample applications, we do not require SystemDefaultTlsVersions for going TLS 1.2. NET Framework version earlier than 4.7 - For. I am a little confused after reading your article.