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If I comment the line pre-up iptables-restore &lt;&nbsp;/etc/iptables.up.rules on /etc/network/interfaces my site works fine. If not everything is blocked. <br />
The content of the file is (just for test) <br />
iptables -P INPUT ACCEPT<br />
iptables -P OUTPUT ACCEPT<br />
iptables -P FORWARD ACCEPT<br />
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What I´m doing wrong
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If I comment the line pre-up iptables-restore < /etc/iptables.up.rules on /etc/network/interfaces my site works fine. If not everything is blocked. 
The content of the file is (just for test) 
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT

What I´m doing wrong

iptables ubuntu BLOCK all

The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.

Linux Networking

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).

Linux Distributions

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.