Use standard .NET TLS version instead of OS TLS version.

This prevents TLS (SChannel 70, EventID 36887) errors and hence unsuccessful connections on Windows versions pre Windows 10. For example, the standard TLS version of Windows 7 is TLS 1.0 which is deprecated. The settings in this commit sets the TLS version to the standard TLS version of the currently installed .NET Framework (4.7.X) instead of the System/OS default TLS version.
johanneszab · Jul 19, 2020 · 9b3b575 · 9b3b575
1 parent 7c3699a
commit 9b3b575
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Showing 4 changed files with 5 additions and 7 deletions.
diff --git a/src/TumblThree/SharedAssemblyInfo.cs b/src/TumblThree/SharedAssemblyInfo.cs
@@ -12,5 +12,5 @@
 
 [assembly: ComVisible(false)]
 [assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.MainAssembly)]
-[assembly: AssemblyVersion("1.0.8.74")]
-[assembly: AssemblyFileVersion("1.0.8.74")]
+[assembly: AssemblyVersion("1.0.8.75")]
+[assembly: AssemblyFileVersion("1.0.8.75")]
diff --git a/src/TumblThree/TumblThree.Applications/App.config b/src/TumblThree/TumblThree.Applications/App.config
@@ -3,10 +3,10 @@
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>
   </startup>
-
   <runtime>
     <loadFromRemoteSources enabled="true"/>
     <ThrowUnobservedTaskExceptions enabled="false"/>
+    <AppContextSwitchOverrides value="Switch.System.Net.DontEnableSystemDefaultTlsVersions=true"/>
   </runtime>
   <system.net>
     <defaultProxy enabled="true" useDefaultCredentials="true"/>

diff --git a/src/TumblThree/TumblThree.Domain/App.config b/src/TumblThree/TumblThree.Domain/App.config
@@ -3,12 +3,11 @@
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>
   </startup>
-
   <runtime>
     <loadFromRemoteSources enabled="true"/>
     <ThrowUnobservedTaskExceptions enabled="false"/>
+    <AppContextSwitchOverrides value="Switch.System.Net.DontEnableSystemDefaultTlsVersions=true"/>
   </runtime>
-
   <system.net>
     <defaultProxy enabled="true" useDefaultCredentials="true"/>
   </system.net>

diff --git a/src/TumblThree/TumblThree.Presentation/App.config b/src/TumblThree/TumblThree.Presentation/App.config
@@ -8,10 +8,10 @@
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>
   </startup>
-
   <runtime>
     <loadFromRemoteSources enabled="true"/>
     <ThrowUnobservedTaskExceptions enabled="false"/>
+    <AppContextSwitchOverrides value="Switch.System.Net.DontEnableSystemDefaultTlsVersions=true"/>
   </runtime>
   <applicationSettings>
     <TumblThree.Presentation.Properties.Settings>
@@ -23,7 +23,6 @@
       </setting>
     </TumblThree.Presentation.Properties.Settings>
   </applicationSettings>
-
   <system.net>
     <defaultProxy enabled="true" useDefaultCredentials="true"/>
   </system.net>