<PackageReference Include="System.Security.Permissions" Version="10.0.4" />

System.Net.SocketPermissionAttribute

Specifies security actions to control Socket connections. This class cannot be inherited.
namespace System.Net { public sealed class SocketPermissionAttribute : CodeAccessSecurityAttribute { public string Access { get; set; } public string Host { get; set; } public string Port { get; set; } public string Transport { get; set; } public SocketPermissionAttribute(SecurityAction action); } }