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ACL first-match evaluation encounters the overly broad permit before restrictive entries. The ACL rule is written for response traffic rather than the initiating packet direction.

The ACL was applied on a logical interface outside the flow's forwarding path. The ACL rule is written for response traffic rather than the initiating packet direction.

Standard IPv4 ACLs do not express the destination/port tuple needed for this policy. The ACL rule is written for response traffic rather than the initiating packet direction.

This test measures a different behavior: Run interface counters and a controlled deny test on the true forwarding path. It does not establish the target outcome. For the documented fault, the direct acceptance test is: trace a single TCP SYN and verify the intended ACL entry increments on the correct interface.

This test measures a different behavior: Test allowed and denied host-to-server TCP443 connections and inspect ACL counters. It does not establish the target outcome. For the documented fault, the direct acceptance test is: trace a single TCP SYN and verify the intended ACL entry increments on the correct interface.

This test measures a different behavior: Inspect ACL syntax and test the intended port-specific application path. It does not establish the target outcome. For the documented fault, the direct acceptance test is: trace a single TCP SYN and verify the intended ACL entry increments on the correct interface.

That diagnosis is supported by a different symptom: Disallowed traffic continues through the active VLAN interface without any ACL hits. Here the recorded observation is: the blocked connection succeeds while a reverse-direction counter increases on an unrelated rule. The applicable cause is: the ACL rule is written for response traffic rather than the initiating packet direction.

That diagnosis is supported by a different symptom: A general permit line above the intended deny lets every source use the server HTTPS service. Here the recorded observation is: the blocked connection succeeds while a reverse-direction counter increases on an unrelated rule. The applicable cause is: the ACL rule is written for response traffic rather than the initiating packet direction.

That diagnosis is supported by a different symptom: The broad standard ACL blocks all protocols from a source instead of only HTTPS. Here the recorded observation is: the blocked connection succeeds while a reverse-direction counter increases on an unrelated rule. The applicable cause is: the ACL rule is written for response traffic rather than the initiating packet direction.

That control reduces a separate risk: Standard IPv4 ACLs do not express the destination/port tuple needed for this policy. For the described design, the recurring risk arises from: the ACL rule is written for response traffic rather than the initiating packet direction. The specific required safeguard is: keep source/destination tuples and enforcement interface in every ACL change record.

That control reduces a separate risk: The ACL was applied on a logical interface outside the flow's forwarding path. For the described design, the recurring risk arises from: the ACL rule is written for response traffic rather than the initiating packet direction. The specific required safeguard is: keep source/destination tuples and enforcement interface in every ACL change record.

That control reduces a separate risk: ACL first-match evaluation encounters the overly broad permit before restrictive entries. For the described design, the recurring risk arises from: the ACL rule is written for response traffic rather than the initiating packet direction. The specific required safeguard is: keep source/destination tuples and enforcement interface in every ACL change record.

Adding required explicit permits would not meet the need for an extended ACL for source, destination, protocol and destination port matching.

Applying an ordered extended ACL permitting the specified TCP443 tuple and deny unintended matching flows at the correct interface/direction would not meet the need for an extended ACL for source, destination, protocol and destination port matching.

The needed correction is to use an extended ACL for source, destination, protocol and destination port matching.

This test measures a different behavior: Test allowed and denied host-to-server TCP443 connections and inspect ACL counters. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect ACL syntax and test the intended port-specific application path.

This test measures a different behavior: Inspect inbound ACL counters and successful permitted traffic in the unaffected direction. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect ACL syntax and test the intended port-specific application path.

This test measures a different behavior: Trace a single TCP SYN and verify the intended ACL entry increments on the correct interface. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect ACL syntax and test the intended port-specific application path.

That diagnosis is supported by a different symptom: A general permit line above the intended deny lets every source use the server HTTPS service. Here the recorded observation is: the broad standard ACL blocks all protocols from a source instead of only HTTPS. The applicable cause is: standard IPv4 ACLs do not express the destination/port tuple needed for this policy.

That diagnosis is supported by a different symptom: The blocked connection succeeds while a reverse-direction counter increases on an unrelated rule. Here the recorded observation is: the broad standard ACL blocks all protocols from a source instead of only HTTPS. The applicable cause is: standard IPv4 ACLs do not express the destination/port tuple needed for this policy.

That diagnosis is supported by a different symptom: The hostile subnet still reaches the SVI because the ACL was applied outbound toward users. Here the recorded observation is: the broad standard ACL blocks all protocols from a source instead of only HTTPS. The applicable cause is: standard IPv4 ACLs do not express the destination/port tuple needed for this policy.

That control reduces a separate risk: The ACL rule is written for response traffic rather than the initiating packet direction. For the described design, the recurring risk arises from: standard IPv4 ACLs do not express the destination/port tuple needed for this policy. The specific required safeguard is: choose ACL type based on actual match fields, not just whether an ACL number is available.

One ordered TCP/443 permit tuple is not enough to establish the requested ACL type and matching fields for the hosted application.

Choosing an ingress SVI is a placement detail; this problem first requires an extended ACL that can match destination and TCP port.

The needed correction is to write explicit permitted return-flow conditions or use a supported stateful security feature where required.

Applying an IPv4 ACL with appropriate source/destination matching on the ingress SVI for the documented flow direction would not address the need for write explicit permitted return-flow conditions or use a supported stateful security feature where required.

Adding required explicit permits would not address the need for write explicit permitted return-flow conditions or use a supported stateful security feature where required.

This test measures a different behavior: Trace a single TCP SYN and verify the intended ACL entry increments on the correct interface. It does not establish the target outcome. For the documented fault, the direct acceptance test is: test complete TCP connection setup and return segments under the chosen policy.

This test measures a different behavior: Test a matching allowed flow and an unlisted flow to verify expected accept/drop behavior. It does not establish the target outcome. For the documented fault, the direct acceptance test is: test complete TCP connection setup and return segments under the chosen policy.

This test measures a different behavior: Inspect inbound ACL counters and successful permitted traffic in the unaffected direction. It does not establish the target outcome. For the documented fault, the direct acceptance test is: test complete TCP connection setup and return segments under the chosen policy.

That diagnosis is supported by a different symptom: The blocked connection succeeds while a reverse-direction counter increases on an unrelated rule. Here the recorded observation is: client SYN leaves successfully but response packets are denied at the inbound enforcement point. The applicable cause is: the stateless ACL has no matching permit for return packets and does not track connection state.

That diagnosis is supported by a different symptom: A new application fails because no permit exists for its destination in the applied ACL. Here the recorded observation is: client SYN leaves successfully but response packets are denied at the inbound enforcement point. The applicable cause is: the stateless ACL has no matching permit for return packets and does not track connection state.

That diagnosis is supported by a different symptom: The hostile subnet still reaches the SVI because the ACL was applied outbound toward users. Here the recorded observation is: client SYN leaves successfully but response packets are denied at the inbound enforcement point. The applicable cause is: the stateless ACL has no matching permit for return packets and does not track connection state.