If you enable proxy to external server, you get "Internal Server Error" when you try to access the website.
The log file shows "SSL Proxy requested for example.domain.tld but not enabled [Hint: SSLProxyEngine]". If you tweak apache.conf and add "SSLProxyEngine on" and restart apache2 the site works perfect. But if you make further changes via TinyCP the "SSLProxyEngine on" addition get deleted.
Please add "SSLProxyEngine on" in the main build so it doesn't get overwritten.