Hello, I am trying to confiure ISPConfig 3.1 to work behind NAT, but I am facing problems. I tried some suggestions here but it doesn't work. Here is so far what I have done: 1. Server Config > IPv4 Address (Internal NAT Address) 2. Server IP Addreess > (Internal NAT Address) 3. Website IP - (Internal NAT Address) 4. DNS IP's - (External IP of the ROUTER) /etc/host file: (External IP) mydomain.com /etc/hostname file: mydomain.com DMZ set on the router. Port 8080 open in UFW and IPTABLES. Still, there are two problems: 1. http_s://(External IP):8080 returns error "Took too long to respond". Internal IP works OK. 2. htt_p://(external IP) or domain.com loads a webpage OK. Please help.