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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca5386 below:

CA5386: Avoid hardcoding SecurityProtocolType value (code analysis) - .NET

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

• A safe but hardcoded System.Net.SecurityProtocolType value was referenced.
• An integer value representing a safe protocol version was assigned to a SecurityProtocolType variable.

Safe values are:

• Tls12
• Tls13

Transport Layer Security (TLS) secures communication between computers, most commonly with Hypertext Transfer Protocol Secure (HTTPS). Protocol versions TLS 1.0 and TLS 1.1 are deprecated, while TLS 1.2 and TLS 1.3 are current. In the future, TLS 1.2 and TLS 1.3 may be deprecated. To ensure that your application remains secure, avoid hardcoding a protocol version and target at least .NET Framework v4.7.1. For more information, see Transport Layer Security (TLS) best practices with .NET Framework.

Don't hardcode TLS protocol versions.

You can suppress this warning if your application targets .NET Framework v4.6.2 or earlier and may run on a computer that has insecure defaults.

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 CA5386
// The code that's violating the rule is on this line.
#pragma warning restore CA5386

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

[*.{cs,vb}]
dotnet_diagnostic.CA5386.severity = none

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

using System;
using System.Net;

public class ExampleClass
{
    public void ExampleMethod()
    {
        // CA5386 violation
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
    }
}

Imports System
Imports System.Net

Public Class TestClass
    Public Sub ExampleMethod()
        ' CA5386 violation
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
    End Sub
End Class

using System;
using System.Net;

public class ExampleClass
{
    public void ExampleMethod()
    {
        // CA5386 violation
        ServicePointManager.SecurityProtocol = (SecurityProtocolType) 3072;    // TLS 1.2
    }
}

Imports System
Imports System.Net

Public Class TestClass
    Public Sub ExampleMethod()
        ' CA5386 violation
        ServicePointManager.SecurityProtocol = CType(3072, SecurityProtocolType)   ' TLS 1.2
    End Sub
End Class

using System;
using System.Net;

public class TestClass
{
    public void TestMethod()
    {
        // Let the operating system decide what TLS protocol version to use.
        // See https://learn.microsoft.com/dotnet/framework/network-programming/tls
    }
}

Imports System
Imports System.Net

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
    End Sub
End Class

CA5364: Do not use deprecated security protocols

CA5397: Do not use deprecated SslProtocols values

CA5398: Avoid hardcoded SslProtocols values

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