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Path-aware routing happens at HTTP layer seven before traffic is forwarded to a selected target. That adjustment does not address the controlling condition: instance running state is distinct from the health check HTTP response required by the target group. Verify targets become healthy when the designated health endpoint returns an expected response.

A fixed response is produced by the load balancer and does not depend on backend target availability. In this situation, instance running state is distinct from the health check HTTP response required by the target group. The proposed change does not ensure targets become healthy when the designated health endpoint returns an expected response.

The source identity visible to a target can differ based on transport and load-balancing configuration. That adjustment does not address the controlling condition: instance running state is distinct from the health check HTTP response required by the target group. Verify targets become healthy when the designated health endpoint returns an expected response.

Session tracking breaks when outbound and return packets are steered through nonsharing firewall states. It does not directly achieve the required result: instances in the new address range can reach the peer without disturbing older CIDRs. The constraint is that the new prefix needs explicit route visibility even when the existing original VPC addresses work.

Failback requires explicit routing preference rather than assuming an active link automatically dominates. It does not directly achieve the required result: instances in the new address range can reach the peer without disturbing older CIDRs. The constraint is that the new prefix needs explicit route visibility even when the existing original VPC addresses work.

Multiple interfaces do not automatically guarantee symmetric operating-system return paths. That adjustment does not address the controlling condition: the new prefix needs explicit route visibility even when the existing original VPC addresses work. Verify instances in the new address range can reach the peer without disturbing older CIDRs.

A correct zone association cannot produce working client resolution when needed VPC DNS support is disabled. For the stated conditions, a firewall that permits only UDP can disrupt larger standards-compliant DNS responses. The more specific mechanism is DNS resolution may fall back from UDP to TCP when responses are truncated or too large.

An obsolete parent delegation signer can make otherwise served DNS answers appear bogus to validators. The reported evidence instead concerns DNS resolution may fall back from UDP to TCP when responses are truncated or too large: a firewall that permits only UDP can disrupt larger standards-compliant DNS responses.

Setting a lower TTL at cutover does not retroactively shorten entries cached at the earlier value. That property alone cannot account for the reported symptom; a firewall that permits only UDP can disrupt larger standards-compliant DNS responses.

An association change can alter BGP-originated reachability without deleting the physical VIF. The reported evidence instead concerns allowed prefixes for a VGW association filter the actual VPC CIDR and cannot originate an arbitrary smaller CIDR: the gateway cannot advertise a nonmatching narrow prefix solely because it was placed in an allowed list.

A new attachment ID is not automatically equivalent to an old one for route visibility. The decisive technical distinction is allowed prefixes for a VGW association filter the actual VPC CIDR and cannot originate an arbitrary smaller CIDR; the gateway cannot advertise a nonmatching narrow prefix solely because it was placed in an allowed list.

A route marked blackhole cannot carry IPv4 outbound traffic regardless of instance state. The decisive technical distinction is allowed prefixes for a VGW association filter the actual VPC CIDR and cannot originate an arbitrary smaller CIDR; the gateway cannot advertise a nonmatching narrow prefix solely because it was placed in an allowed list.

Multiple healthy links can compete for the same destination; configuration controls the selected route. The reported evidence instead concerns inter-Region TGW peering needs matching explicit static routes toward the peer attachment: peer connection state does not automatically propagate remote VPC CIDR changes.

An association change can alter BGP-originated reachability without deleting the physical VIF. The reported evidence instead concerns inter-Region TGW peering needs matching explicit static routes toward the peer attachment: peer connection state does not automatically propagate remote VPC CIDR changes.

A route-table entry is not proof the next-hop attachment remains operational. That property alone cannot account for the reported symptom; peer connection state does not automatically propagate remote VPC CIDR changes.

A deployed template cannot guarantee continued agreement after direct console mutations. The decisive technical distinction is AWS CDK synthesizes application code into CloudFormation-based infrastructure definitions; cDK is an authoring layer, not a replacement for CloudFormation's deployed resource lifecycle.

IaC syntax validity does not establish compliance with organizational network policy. The decisive technical distinction is AWS CDK synthesizes application code into CloudFormation-based infrastructure definitions; cDK is an authoring layer, not a replacement for CloudFormation's deployed resource lifecycle.

An event can trigger a bounded response without granting the workflow permission to reconfigure every gateway. That property alone cannot account for the reported symptom; cDK is an authoring layer, not a replacement for CloudFormation's deployed resource lifecycle.

Event-driven code can enforce organizational metadata conventions without granting unrestricted administrator access. That adjustment does not address the controlling condition: event-driven actions need traceable provenance to distinguish operator change from subsequent automated adjustment. Verify auditors reconstruct the network modification and its automatic follow-up from correlated records.

One organization's manual copy/paste cannot maintain consistent revisions as account counts grow. In this situation, event-driven actions need traceable provenance to distinguish operator change from subsequent automated adjustment. The proposed change does not ensure auditors reconstruct the network modification and its automatic follow-up from correlated records.

Static copied gateway IDs can drift after replacement, causing invalid routes. It does not directly achieve the required result: auditors reconstruct the network modification and its automatic follow-up from correlated records. The constraint is that event-driven actions need traceable provenance to distinguish operator change from subsequent automated adjustment.

Creating a rule on a shared outbound endpoint does not cause every VPC to use it automatically. The needed control instead targets VPC DNS settings affect the resolver capabilities used by private hosted zones; it succeeds when instances resolve the private zone after correcting the VPC DNS settings.

Split-horizon configuration can intentionally prevent public answers from leaking into an internal namespace. In this situation, a correct zone association cannot produce working client resolution when needed VPC DNS support is disabled. The proposed change does not ensure instances resolve the private zone after correcting the VPC DNS settings.

Inbound and outbound endpoint directions describe where queries enter or leave the VPC DNS service. In this situation, a correct zone association cannot produce working client resolution when needed VPC DNS support is disabled. The proposed change does not ensure instances resolve the private zone after correcting the VPC DNS settings.

An outbound endpoint is a transport mechanism; rule matches determine which names use that transport. In this situation, setting a lower TTL at cutover does not retroactively shorten entries cached at the earlier value. The proposed change does not ensure the migration proceeds within the planned resolver cache convergence window.

Inbound and outbound endpoint directions describe where queries enter or leave the VPC DNS service. In this situation, setting a lower TTL at cutover does not retroactively shorten entries cached at the earlier value. The proposed change does not ensure the migration proceeds within the planned resolver cache convergence window.

A firewall that permits only UDP can disrupt larger standards-compliant DNS responses. The needed control instead targets DNS recursive caches can continue using prior answers until their previous TTL expires; it succeeds when the migration proceeds within the planned resolver cache convergence window.

Private endpoint DNS behavior is separate from merely establishing the private network interface. That adjustment does not address the controlling condition: a gateway endpoint's route works only for route tables explicitly associated with it. Verify S3 requests take the gateway endpoint path without a NAT or Internet Gateway.

Service scoping reduces blast radius compared with unrestricted full VPC network connectivity. The needed control instead targets S3 gateway VPC endpoints provide private service routing through selected VPC route tables; it succeeds when S3 requests take the gateway endpoint path without a NAT or Internet Gateway.

IPv4 NAT gateway behavior is not a substitute for IPv6-specific outbound-only internet routing. It does not directly achieve the required result: S3 requests take the gateway endpoint path without a NAT or Internet Gateway. The constraint is that a gateway endpoint's route works only for route tables explicitly associated with it.

An active VIF and BGP session do not automatically override VPC subnet forwarding decisions. The needed control instead targets tGW route-table associations determine which routing view is used when traffic enters each attachment; it succeeds when traffic from AWS to the corporate prefix and back follows matching TGW route tables.

Gateway attachments are route targets; incorrect associations can blackhole return flows despite healthy tunnels. That adjustment does not address the controlling condition: the propagated VPN prefix may exist in a different TGW table than the one used by the application VPC. Verify traffic from AWS to the corporate prefix and back follows matching TGW route tables.

A healthy VPN tunnel does not automatically install every required prefix into every TGW routing domain. The needed control instead targets tGW route-table associations determine which routing view is used when traffic enters each attachment; it succeeds when traffic from AWS to the corporate prefix and back follows matching TGW route tables.