Even when the less secure TLS 1.0 and 1.1 have been disabled on a network or computer, some Snow applications may continue to try and use these versions to secure communications. This happens because some versions of the .Net Framework default to these versions. Follow the procedure below to update the applications to ignore this .Net configuration in favor of the most secure option available. 
 

1. Make a backup copy of the .config file for the application before you begin, so you can rollback in case something goes wrong. 
2. Open the .config file for the application using a text editor such as Notepad++.
3. Inside the <configuration> element, add the following content (<configuration> element included for your reference -- do not duplicate it):

4. Save the file and restart the application.

Here's an example of the .config file for Snow Update Services with the required content added:

Alternatively, follow the procedure below to set this configuration in the Windows registry. Doing so affects all the applications installed on the computer exmploying the configured framework. Modifying the registry can be dangerous and may cause system instability or even data loss if not done properly. 

1. Backup the registry before making any changes. 
2. In the Registry Editor for the application server, expand the tree to find the configuration node for .NET Framework
   • For .NET Framework version 2.0.50727, go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v2.0.50727.
   • For .NET Framework version 4.0.30319, go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319.
3. For each installed version:
   • Create a new DWORD value named SystemDefaultTlsVersions and set its value to 1.
   • Create a new DWORD value named SchUseStrongCrypto and set its value to 1.
4. Restart the application.