497             case ERROR_PROTOCOL_UNREACHABLE:

   497             case ERROR_PROTOCOL_UNREACHABLE:

   498             case ERROR_PORT_UNREACHABLE:

   498             case ERROR_PORT_UNREACHABLE:

   499             case ERROR_REQUEST_ABORTED:

   499             case ERROR_REQUEST_ABORTED:

   500             case ERROR_INCORRECT_ADDRESS:

   500             case ERROR_INCORRECT_ADDRESS:

   501             case ERROR_HOST_DOWN:

   501             case ERROR_HOST_DOWN:

   502             case WSAEHOSTUNREACH:   /* Host Unreachable */

   504             case WSAEHOSTUNREACH:   /* Host Unreachable */

   503             case WSAENETUNREACH:    /* Network Unreachable */

   505             case WSAENETUNREACH:    /* Network Unreachable */

   504             case WSAENETDOWN:       /* Network is down */

   506             case WSAENETDOWN:       /* Network is down */

   505             case WSAEPFNOSUPPORT:   /* Protocol Family unsupported */

   507             case WSAEPFNOSUPPORT:   /* Protocol Family unsupported */

   506             case IP_REQ_TIMED_OUT:

   508             case IP_REQ_TIMED_OUT: