I installed Proxmox 5.I have 5 static ips. I'm running 1 ip for the host,2 webservers (ubuntu 16.04 ispconfig 3.1,2nd dns),1 windows 7,1 cloudserver (ubuntu 16.04 nextcloud). I have internet connection on all machines. My isp said all ports are open by default on static ips. But when I go to my ip:8080 I get no connection. when I go to my ip:80 I get a connection. What could be blocking my connections on some of my ports?