While Accepting an incoming FIX connection, additional authentication checks may be required. The typical checks are Logon username/password and source IP address.
The required authentification logic could be added to the OnixS::FIX::ISessionListener::onInboundSessionMsg(..) method. If the authentication fails and the FIX connection needs to be rejected (closed) then the
std::runtime_error exception (or the derived one) should be thrown.
std::runtime_error exception is thrown and OnixS::FIX::EngineSettings::sendLogoutOnException(..) or OnixS::FIX::Session::sendLogoutOnException(..) is set to
true then the Logout FIX message will be sent before closing the FIX connection. Otherwise, the connection will be closed immediately.