https://learn.microsoft.com/ja-jp/dotnet/api/system.net.security.authenticatedstream.disposeasync?view=netstandard-2.1&viewFallbackFrom=net-10.0
AuthenticatedStream.DisposeAsync Method (System.Net.Security) | Microsoft Learn
Asynchronously releases the unmanaged and managed resources used by the AuthenticatedStream.
net securitymethodsystemmicrosoftlearn