## WCF message security now is able to use TLS1.1 and TLS1.2

### Scope
Edge

### Version Introduced
4.7

### Source Analyzer Status
Planned

### Change Description
Starting in the .NET Framework 4.7, customers can configure either TLS1.1 or TLS1.2 in WCF message security in addition to SSL3.0 and TLS1.0 through application configuration settings. 

- [x] Quirked
- [ ] Build-time break

### Recommended Action
In the .NET Framework 4.7, support for TLS1.1 and TLS1.2 in WCF message security is disabled by default. You can enable it by adding the following line to the `<runtime>` section of the app.config or web.config file:

   ```xml
   <runtime>
      <AppContextSwitchOverrides value="Switch.System.ServiceModel.DisableUsingServicePointManagerSecurityProtocols=false;Switch.System.Net.DontEnableSchUseStrongCrypto=false" />
   </runtime>
   ```   

### Category
Windows Communication Foundation (WCF)

<!-- breaking change id: 167 -->