I recently installed Hiawatha and proceeded to install ISPConfig 3 on my Debian Jessie machine. I followed the tutorial for the automated script which finished. I couldn't really cat the errors as it kept trying to bring up a blue prompt screen in putty and closed immediately. Interesting. I've uploaded the logs for reference. Anyways, ISPConfig 3 is unreachable at port 8080, and also appears to have not init.d script available.
ISPConfig does not have a init-script, it runs as a website configured in apache/nginx whichever you choose. Something went wrong with the automatic setup ( why do ppl don't like to know/see what's going on on their servers ... ) Try again using the howto.
