Re: [Boost-users] [Boost.asio] Second multicast async_send_to returns 10009

error 10009 probably means that the handle of your socket is invalid. Maybe, the socket object is destroyed? Put a breakpoint at MulticastServer destructor and look when you come there and why... 2008/8/9, John Urberg :

I'm using boost asio to send out multicast hailing messages every 15 seconds from an ActiveX control using boost 1.35.0 and VC9. I had a proof of concept ActiveX working fine, but in my production ActiveX, I'm able to send the first message successfully, but every subsequent message returns a 10009 error.