Comment by schoen

It would be super-awesome of you if you could let us know about those errors at

https://github.com/letsencrypt/lets-encrypt-preview/issues

or e-mail me about them. So far this has only been tested on a handful of configurations and will clearly need to be tested on many more over the next few months.

Please be careful when running it on your live server: if it does manage to get a cert right now, that cert won't be accepted by clients and will produce cert warnings (and if you use the "Secure" option at the end, you'll also be generating redirects from the HTTP site to the cert-warning-generating HTTPS version).