Hi John, Welcome to this mailing list! Doesn't Asio call SSL_shutdown here: https://github.com/chriskohlhoff/asio/blob/master/asio/include/asio/ssl/deta il/impl/engine.ipp#L325 ? Regarding memory leaks - cold you please provide a minimal example reproducing memory leak including the way you detect memory leak? Could chriskohlhoff/asio GitHub issue #368 (https://github.com/chriskohlhoff/asio/issues/368) be your case? Regards, Marat Abrarov.