On Fri, 1 Jun 2007, m wrote:

>> curl ftp://myusername:mypassword@ftp.myserver.com;
>> curl ftp://myusername:mypassword@ftp.myserver.com
>
> What I get back is a directory listing corresponding to the first call to
> curl, but then for the second, I get:
>
>> curl: (67) Access denied: 530
>
> The same thing happens if I issue the two curl commands on separate lines or
> even in different terminal windows as long as the second curl is within a
> second or so of the first. It is as if Yahoo is imposing a minimum time
> interval between connection attempts.

Well, if you use -v you'll see the full command/response traffic and then
you'll probably see that the server responds this and there's not much more
that curl can do about it.

So yes, I would say it looks like the server is imposing a minimum time
interval.

-- 
  Commercial curl and libcurl Technical Support: http://haxx.se/curl.html