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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca5397 below:

CA5397: Do not use deprecated SslProtocols values (code analysis) - .NET

This rule fires when either of the following conditions are met:

• A deprecated System.Security.Authentication.SslProtocols value was referenced.
• An integer value representing a deprecated value was either assigned to a SslProtocols variable, used as a SslProtocols return value, or used as a SslProtocols argument.

Deprecated values are:

• Ssl2
• Ssl3
• Tls
• Tls10
• Tls11

Transport Layer Security (TLS) secures communication between computers, most commonly with Hypertext Transfer Protocol Secure (HTTPS). Older protocol versions of TLS are less secure than TLS 1.2 and TLS 1.3 and are more likely to have new vulnerabilities. Avoid older protocol versions to minimize risk. For guidance on identifying and removing deprecated protocol versions, see Solving the TLS 1.0 Problem, 2nd Edition.

Don't use deprecated TLS protocol versions.

You can suppress this warning if:

• The reference to the deprecated protocol version isn't being used to enable a deprecated version.
• You need to connect to a legacy service that can't be upgraded to use secure TLS configurations.

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable CA5397
// The code that's violating the rule is on this line.
#pragma warning restore CA5397

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.CA5397.severity = none

For more information, see How to suppress code analysis warnings.

using System;
using System.Security.Authentication;

public class ExampleClass
{
    public void ExampleMethod()
    {
        // CA5397 violation for using Tls11
        SslProtocols protocols = SslProtocols.Tls11 | SslProtocols.Tls12;
    }
}

Imports System
Imports System.Security.Authentication

Public Class TestClass
    Public Sub ExampleMethod()
        ' CA5397 violation for using Tls11
        Dim sslProtocols As SslProtocols = SslProtocols.Tls11 Or SslProtocols.Tls12
    End Sub
End Class

using System;
using System.Security.Authentication;

public class ExampleClass
{
    public void ExampleMethod()
    {
        // CA5397 violation
        SslProtocols sslProtocols = (SslProtocols) 768;    // TLS 1.1
    }
}

Imports System
Imports System.Security.Authentication

Public Class TestClass
    Public Sub ExampleMethod()
        ' CA5397 violation
        Dim sslProtocols As SslProtocols = CType(768, SslProtocols)   ' TLS 1.1
    End Sub
End Class

using System;
using System.Security.Authentication;

public class TestClass
{
    public void Method()
    {
        // Let the operating system decide what TLS protocol version to use.
        // See https://learn.microsoft.com/dotnet/framework/network-programming/tls
        SslProtocols sslProtocols = SslProtocols.None;
    }
}

Imports System
Imports System.Security.Authentication

Public Class TestClass
    Public Sub ExampleMethod()
        ' Let the operating system decide what TLS protocol version to use.
        ' See https://learn.microsoft.com/dotnet/framework/network-programming/tls
        Dim sslProtocols As SslProtocols = SslProtocols.None
    End Sub
End Class

CA5364: Do not use deprecated security protocols

CA5386: Avoid hardcoding SecurityProtocolType value

CA5398: Avoid hardcoded SslProtocols values

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