<PackageReference Include="System.Security.Permissions" Version="11.0.0-preview.2.26159.112" />

System.Net.SocketPermission

Controls rights to make or accept connections on a transport address.
namespace System.Net { public sealed class SocketPermission : CodeAccessPermission, IUnrestrictedPermission { public const int AllPorts = -1; public IEnumerator AcceptList { get; } public IEnumerator ConnectList { get; } public SocketPermission(NetworkAccess access, TransportType transport, string hostName, int portNumber); public SocketPermission(PermissionState state); public void AddPermission(NetworkAccess access, TransportType transport, string hostName, int portNumber); public bool IsUnrestricted(); } }