Originally Posted by falko
IS the old domain referenced somewhere in /root/ispconfig/httpd/conf/httpd.conf?
Thank you so much, falko! This was the problem. It had two more lines with the old domain in it. There is good chance that I edited that file before, because two lines already reflected the new domain.
I restarted the server after the change, since I wasn' t sure if I had to restart any services. Now I don' t get redirected anymore when I access the new domain. Accessing the old domain redirects to the new one.
So you have to edit these files, if you want to change the main (ispconfig) domain: