I noticed that with lftp 3.7.8 (Ubuntu 9.04) and lftp 3.7.13 (Ubuntu 9.10) when using the mirror command on a https connection that eventually the lftp program segfaults. I filed a bug report about the issue on launchpad.net as I use Ubuntu but wanted to bring the issue to your attention as well.
https://bugs.launchpad.net/ubuntu/+source/lftp/+bug/388632 Thanks Chris Cheney
