c++ – Boost::ASIO resolve muliple addresses

I’m having some problems resolving multiple addresses using Boost::ASIO. I can call async_resolve once, get an endpoint, and connect to it without issues. But if I want to call async_resolve again at a later point, async_resolve hangs forever and never calls my event handler.

Is there a way to finish or close the previous async_resolve? Or is it something else?

hostResolver = new boost::asio::ip::tcp::resolver(*internalEventPump->getIoService());
    
hostResolver->async_resolve(boost::asio::ip::tcp::v4(), hostName, portString,
    boost::bind(&DTcpSocket::resolveFinished, this, boost::asio::placeholders::error, boost::asio::placeholders::iterator));

…

void DTcpSocket::resolveFinished(const boost::system::error_code &errorCode,
                                 boost::asio::ip::tcp::resolver::iterator iterator)
{
    endPointIter = iterator;

    if (errorCode)
    {
        errMsg = "Couldn't resolve hostname: " + errorCode.message();
        connectionHandler(errMsg, DA_HOSTNAME_ERROR);
    }
    else
    {
        boost::asio::ip::tcp::endpoint endpoint = *endPointIter;
        cout << endpoint.address() << endl;

        endPointIter++;//we'll try to connect to this endpoint if the first endpoint failed.
        clientSocket->async_connect(endpoint, boost::bind(&DTcpSocket::connectFinished, this,
                                                          boost::asio::placeholders::error));
    }
}//resolveFinished