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SslProtocols.Tls and SslProtocols.Tls11 are marked as obsolete, starting in .NET 7. Using these enumeration fields in code generates warning SYSLIB0039 at compile time.
Workaround
Use a higher TLS protocol version, or use SslProtocols.None to defer to system defaults.
Suppress a warning
If you must use the obsolete APIs, you can suppress the warning in code or in your project file.
To suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the warning.
// Disable the warning.
#pragma warning disable SYSLIB0039
// Code that uses obsolete API.
// ...
// Re-enable the warning.
#pragma warning restore SYSLIB0039
To suppress all the SYSLIB0039 warnings in your project, add a <NoWarn> property to your project file.
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
...
<NoWarn>$(NoWarn);SYSLIB0039</NoWarn>
</PropertyGroup>
</Project>
For more information, see Suppress warnings.
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