I admit I screwed up. I had enabled letsencrypt SSL certificates automatically using the perfect server guide, and all was well. SSL was updating regularly for months. Today, I logged into my ISPconfig console on mydomain and on port 8080, and while I was there, I ticked the checkboxes for my domain titled (I think) use letsencrypt SSL and one other that was related to SSL. In my head, I thought it would override the SSL settings I had that were working. Don't know what happened, but now I can't log into ISPconfig, and my website and domain are no longer accessible. I get the error "ERR_CONNECTION_REFUSED" when I try to connect to either my website or ISPconfig (also tied to my domain, but on port 8080). How can I get back into ISPconfig and undo my change? Clearly, there's a mismatch between SSL info between ISPconfig, and what my webserver THINKS it should be. I'm using Ubunto 16.04, with Apache2, with ISPconfig 3.1. I can ssh into my server, and the Dovecot mail server is still receiving mail, although I can't log into the web interface anymore either (mydomain.us/roundcube) due to the connection refused error. Thank you for any ideas on how to undo my change so I can get back into ISPconfig and fix my domain is very much appreciated.