Re: [Boost-users] [ASIO] async_accept : Error m_val 1.

m_val = 1; m_cat = 0x00ab8d00 instance;  | [boost::asio::error::detail::misc_category] = {...}  | boost::noncopyable_::noncopyable = {...}  | __vfptr = 0x00a8bf18 const boost::asio::error::detail::misc_category::`vftable'

Use message() member function of error_code to see the error description. IIUC, in your case it should be "Already open", i.e. you're trying to accept new connection to a socket which was already open.