Category Archives: Palo Alto

A failed ping involving a Palo Alto Networks firewall is a symptom, not a diagnosis. ICMP echo traffic can fail because the firewall interface itself is not configured to answer, because transit traffic is denied by security policy, because a route points the wrong way, or because the remote device does not return the reply. […]

For decades, traditional firewalls served as the primary line of defense for organizational networks, operating on the relatively simple principle of allowing or blocking traffic based on IP addresses and port numbers. This approach worked reasonably well in an era when network traffic was largely predictable and applications used fixed, well-known ports for communication. However, […]