Ensure ufw Default Deny Firewall Policy
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Description
A default deny policy on connections ensures that any unconfigured
network usage will be rejected.
Note: Any port or protocol without a explicit allow before the default
deny will be blocked.
Rationale
With a default accept policy the firewall will accept any packet that
is not configured to be denied. It is easier to allow acceptable
usage than to block unacceptable usage.
Warning
Changing firewall settings while connected over network can
result in being locked out of the system.
