Our website is working fine. You can see 'dns,setup.jsp' is also fine on our demo site. It's the latest version updated from an older one. If you get any error from webpages, run it on foreground and see what message is on console whey you get 500 error on your browser.
There's no speical way for copy/restore config. Just make a backup from 'Config > Backup' and extract it into /nxfilter/db on the new one and restart it.