OK... so I've decided to reconfigure my install of ISPConfig so it is on its own IP (only used by DNS, ssh, and mail otherwise - my hosted sites all use a different IP) and to make it listen to 443 instead of 81. After that, I'll be getting a "real" SSL cert. So I've gotten ISPConfig to only listen to one address. All hosted sites are being served up by apache2 on a different address. No problem, did it following the directions that Falko and Till have posted on changing domain name, etc. And it all works! Next I replaced all instances of 81 with 443 in /root/ispconfig/httpd/conf/httpd_conf and in /home/admispconfig/ispconfig/lib/config.inc.php - and I can no longer connect to ISPConfig, or telnet to the IP port 443 that it should be listening to, or see any signs of it in the output of netstat. I think that ISPConfig isn't restarting after my config change, even though it reports that it is in the console. Any idea on log files, etc. to look in for a clue? Once I'm successful I think I'll write a little shell script to do this and post it... I've seen a few other posts like mine, but nothing definitive as far as a fix goes.