What could be the potential impact of changing the registry value Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319\SystemDefaultTlsVersions from 0 to 1. Could it have any negative impacts for other applications, tools, etc...?

Question

User was unable to login to Power BI the login window was not appearing.
But after changing the Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework\v4.0.30319\SystemDefaultTlsVersions registry value from 0 to 1 on my machine.  It seems to resolve the issue.  We are working to understand if this change could cause any potential negative impact to other applications or tools.?

Answer 1

Hi, @Suraj Bowade (Accenture International Limite)

Thank you for posting in Microsoft Q&A forum.

Changing the registry value Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework\v4.0.30319\SystemDefaultTlsVersions from 0 to 1 allows the .NET Framework 4.x to inherit its defaults from the Windows Schannel DisabledByDefault registry values.

This enables the use of the latest versions of TLS supported by the OS, including TLS 1.2. If your app targets .NET Framework 4.7 or later versions, this key defaults to a value of 1, which is a secure default that is recommended. If your app targets .NET Framework 4.6.1 or earlier versions, the key defaults to 0. In that case, you should explicitly set its value to 1.

This change should not cause any impact on other applications or tools.

https://learn.microsoft.com/en-us/dotnet/framework/network-programming/tls#systemdefaulttlsversions

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