Web Manager for Administrators > Configuration>Network>Firewall Configuration > Firewall Configuration: Deleting Chains

Firewall Configuration: Deleting Chains
If one of the default chains is selected and the “Delete” button is pressed under Configuration>Network>Firewall Configuration in Expert mode, the chain is deleted.
Default chains cannot be deleted. If a user-defined chain is selected and the “Delete” button is pressed, the message shown in the following figure appears.
Firewall Configuration “Delete Default Chain” Dialog Box

Web Manager for Administrators > Configuration>Network>Firewall Configuration > Firewall Configuration: Deleting Chains