ISPConfig control panel is dead after creating self signed certificate

Hi,
I'm a fresh ISPConfig user stuck with a dead control panel.
The problem started after creating a self signed certificate for two hosted domains.
I also created some mailing lists and web/email domains. They were all working before I created the SSL stuff.
Only the email domains now work. The normal web domains return with a:

The https pages (including the one form the ispconfig control panel) return with a SSL connection error:

Looks like there are (at least) two problems. Google didn't give a direction for neither of these two issues.
How do I get my panel back online?

<edit> Providing more usable data:
Using Debian Wheezy, ISPConfig 3.0.5
In all queries to the web server, I get an error logged in /var/log/apache2/lists-error.log
I thought that was the mailman HTTP logging
It says: client denied by server configuration: /etc/apache2/htdocs
I have no such file.
</edit>

Thanks very much
Jeroen.

 

Can anyone shine some light on this?
Would be appreciated a lot.

 

For anyone interested in which improvements turned out not to be improving amnything:
I edited an PHP file as root
and forgot to check the permissions
Other problem was that I set the server's IP address in the mailman.conf VirtualHost entry instead of *:80
Regards,
Jeroen.