Please can you reply with your firewall rules from:

iptables -nvL

iptables -nvL -t nat

And please put the result between code tags? If you need to, you can redirect the output to file and copy and paste from there, but you should also be able to directly copy from PuTTy just by selecting the text.

[edit]
please note that if we can't get the diagnostics and no one else reports the issue, we will probably not revert the change.

With your output, can you also give the output from:

ifconfig | grep '^\S' -A 1

grep IF /etc/clearos/network.conf

[/edit]

OK, I know the change and, this time when testing, I am getting very inconsistent results so I am confused. I am just pushing a build to revert the change, but you can do it in advance. To indo the change, go to /usr/clearos/apps/firewall/deploy/firewall.lua and you will see linies 953-955 commented out with a "--". Just remove the "--" for the three lines changing:

            --        iptables("nat",

            --            string.format("-A POSTROUTING -d %s -p %d -s %s/%s --dport %s -j SNAT --to %s",

            --            r_addr, r_proto, network, netmask, dport, ip))

to:

                    iptables("nat",

                        string.format("-A POSTROUTING -d %s -p %d -s %s/%s --dport %s -j SNAT --to %s",

                        r_addr, r_proto, network, netmask, dport, ip))

Then restart the firewall with a "systemctl firewall restart".

Can I make a couple of points?
1 - Normally you would make an entry in your DNS Server pointing your FQDN to the LAN IP of your web server so that the private IP was used when inside your LAN.
2 - There was a forum sticky post asking people to test the change. It did not get a single reply. In the Community you can expect occasional breakages and this one could have been prevented if people had tested and fed back the results.