To answer your last question first, you would open the dashboard and set up remote access again, I believe (I haven't done this for a couple of years, though).
As for the original issue, the simplest way to get everything working again is to restore a server backup from a time before you tried to manipulate the certificates. If you don't have a backup, you could try reinstalling. I understand that this is probably
not what you want to be doing, but what you did in the first place is unsupported, and depending on what
specifically you changed, when, and in what order you attempted configuration changes, there are a goodly number of ways things could now be messed up, so it may well be less trouble all around to just reinstall.
I'm not on the WHS team, I just post a lot. :)
