Azure Firewall

Azure Firewall is a managed firewall that sits inside Azure networking. It can filter traffic using network rules, application rules, NAT rules, threat intelligence, and policies shared across environments.

The logs are often as useful as the firewall itself. With KQL, you can query denied flows, noisy clients, destination patterns, and rule matches without digging through raw diagnostic output by hand.

As with any firewall, clarity matters. A rule base that nobody can read will eventually become a museum of old exceptions. Name rules well, keep policies grouped by purpose, and review what is still needed.