Cannot set app to use system default TLS version by adding appcontext settings in web.config

Question

According to .net guidance of TLS protocol programming, it suggests to config security via appcontext switch when your project targets on .net 4.6. This way works when add appcontext in app.config for console application. However, it doesn't work when add appconext switch in web.config for website project.

This is the config I add.

<runtime>
   <AppContextSwitchOverrides value="Switch.System.Net.DontEnableSchUseStrongCrypto=false;Switch.System.Net.DontEnableSystemDefaultTlsVersions=false"/>
</runtime>

score 15 · Accepted Answer · edited Feb 11 '20 at 12:48

15

AppContext switches usage in web config file:

<appSettings>
    <add key="AppContext.SetSwitch:Switch.System.Net.DontEnableSchUseStrongCrypto" value="false" />
    <add key="AppContext.SetSwitch:Switch.System.Net.DontEnableSystemDefaultTlsVersions" value="false" />
</appSettings>

https://github.com/dotnet/docs/issues/6675

edited Feb 11 '20 at 12:48

Tom Aalbers

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answered Aug 20 '18 at 01:44

raychen3

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while this works, setting `` may also work. https://stackoverflow.com/a/55553516/767425 – Tsahi Asher Oct 19 '20 at 12:15

Cannot set app to use system default TLS version by adding appcontext settings in web.config

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