I’ve been trying to uncover some anomalies with the servers and finally found the root cause. iptables on NethServer do not have the same rules as shorewall. In a number of circumstances, when someone has updated shorewall with their preferred settings and rules, one may encounter issues because iptables is still running and does not use the same rules as shorewall.
My current workaround is:
- disable and stop iptables from running altogether
- manually update iptables with the same rules as shorewall, this can be cumbersome and problematic for most if they are not familiar with iptables.