SSL certificate problems creep up when working with some OpenID providers
(namely MyOpenID). This is typically due to an outdated CA cert bundle being
used by libcurl. An explanation of the problem and a couple of solutions
can be found <a href="http://lists.openidenabled.com/pipermail/dev/2007-August/000784.html">here</a>.