an error occurs after GetQueuedCompletionStatus returns, error number is ERROR_INVALID_NETNAME - iocp

Question

GetQueuedCompletionStatus fails with ERROR_INVALID_NETNAME. What does this mean? I tried looking in MSDN.
First step: connect to the server using ConnectEx. ConnectEx succeeds, with error code 997 (ERROR_IO_PENDING):
DWORD bytes = 0;
sockaddr_in addr = {0};
iocp_data_t * iocp = (iocp_data_t *)module->data;
addr.sin_addr.s_addr = ip;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if(!iocp->tcp_connectex(event->fd, (const sockaddr*)&addr, sizeof(sockaddr_in),
NULL, 0, NULL, &event->connect.overlap))
{
if(!ERR_RW_RETRIABLE(socket_geterror(event->fd)))
{
return false;
}
}
return true;
GetQueuedCompletionStatus returns after the ConnectEx call finishes, but with error code 1214 (ERROR_INVALID_NETNAME):
fd_event_t * fd_event;
iocp_data_t * iocp = (iocp_data_t *)module->data;
rc = GetQueuedCompletionStatus(iocp->iocp, &bytes, (PULONG_PTR)&fd_event,
(LPOVERLAPPED *) &event, (u_long) 1);
if(event == NULL)
{
return;
}
DWORD err = GetLastError(); // err = 1214
event = containing_record(event,event_t,overlap);
if(event->in_used)
{
if(event->event_handler != NULL)
{
event->event_handler(module,fd_event,event->type,event->user);
}
iocp_add_event(module,fd_event,event->type,event->event_handler,event->user);
}

Answer 1

A couple things to check:
Where does ip come from? You might need to use htonl.
How is the socket created? Perhaps your particular socket can't deal with IPv4 addresses (e.g. it's an IPv6 socket).
Also, make sure GetQueuedCompletionStatus returns FALSE before calling GetLastError. GetQueuedCompletionStatus has three possible outcomes:
Return value of TRUE:
Completion packet dequeued successfully, and the I/O finished successfully.
Return value of FALSE, with the OVERLAPPED set to NULL:
GetQueuedCompletionStatus itself failed to dequeue a completion (e.g. timed out).
Return value of FALSE, with the OVERLAPPED not NULL:
Completion packet dequeued, but the I/O it represents failed.