@deftypefun {void} {gnutls_anti_replay_enable} (gnutls_session_t @var{session}, gnutls_anti_replay_t @var{anti_replay}) @var{session}: is a @code{gnutls_session_t} type. @var{anti_replay}: is a @code{gnutls_anti_replay_t} type. Request that the server should use anti-replay mechanism. @strong{Since:} 3.6.5 @end deftypefun