User guide

Chapter 9: Security
93
Note: Rules are added using the IPTables command to the kernel.
These rules take effect immediately but persist permanently only
after clicking the Save button. If there is a mistake in the rules and as
a result, the unit becomes inaccessible, while the Save action allows
you to recover from the mistake. Reboot the system. If you do not
Save the rules, you lose them in the reboot.