Firewall Policy Basics
46 incident problems about Firewall Policy Basics. Start with the reviewed ones.
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All problems (46)
NETWORK-1288A NAT exemption rule looks correct but VPN traffic still translatesA site-to-site VPN works on the old firewall and breaks after migration even though the visible exemption rule was recreated.NetworkIntermediate16 minProK8S-1280A Service works inside the cluster but NLB traffic failsA LoadBalancer Service behaves perfectly in-cluster and starts failing only for outside clients after NLB source preservation enters the path.KubernetesIntermediate16 minProK8S-1260A Service exposes the app but external traffic still failsA Service exposes the app but external traffic still fails focuses on firewall-policy-basics and asks the reader to isolate the key signal in AWS. A healthy Service and healthy pods do not prove the cloud load balancer can traverse the node-s...KubernetesIntermediate17 minProNETWORK-1219DNS over TCP works but UDP queries still failOperators validate a DNS query successfully over TCP and miss that ordinary client UDP traffic is still blocked.NetworkIntermediate17 minProLINUX-1219Firewall rules persist on disk but reboot restores an older iptables viewAn admin saves working firewall rules, reboots, and finds the old behavior back even though the config file never changed.LinuxAdvanced19 minProLINUX-1213nftables rules load but container traffic still bypasses themA host nftables policy is restored at boot, but container startup later rewires the live path.LinuxAdvanced20 minPro