My understanding of AWstats is that it inherently will not work with nginx because it relies on CGI and nginx only supports FastCGI. However, there are some possible workarounds out there (including from nginx wiki) that could make AWstats run in nginx. Given this, does ISPConfig 3 have any of these necessary workarounds built in order to support AWstats on nginx? Or if nginx is the selected web-server, does AWstats simply not work?
AWStats is working out of the box with nginx. AWStats is run by a cron job which creates HTML files, and these HTML files are served by nginx.