If your firewall refuses to start on OpenVZ, please do the following:
Stop the IP Tables: service iptables stop
And then edit the following file: nano /etc/apf/conf.apf
Change IFACE_TRUSTED="Etho"
to IFACE_TRUSTED="venet0"
then save it.
Then you can start the IP tables service iptables start
.
Thanks to MrGeekChris for this fix.
If that still doesn't work.
Go to Server > Firewall and ensure the Trusted Interfaces: is not checked for etho, then the firewall will start.
Thanks to Paul for the above fix.