The answer is to check the health check configuration and target group health status, review ALB access logs, and verify security group rules. These three actions directly address the root cause of 502 errors when troubleshooting ALB 502 errors for SAP Web Dispatcher, because a 502 Bad Gateway typically means the ALB received a TCP connection error or an invalid response from the target. Checking health status reveals if Web Dispatchers are marked unhealthy, access logs pinpoint the exact HTTP response codes and target IPs, and security group rules ensure the ALB’s subnet can communicate with the dispatchers on the required ports. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your ability to isolate network-layer and application-layer failures in a highly available SAP landscape, where misconfigured health checks or overly restrictive security groups are common traps. A useful memory tip is “HAL” for Health, Access logs, and security Lists—the three pillars of ALB 502 diagnosis.
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is running SAP on AWS and uses an Application Load Balancer (ALB) to distribute traffic to SAP Web Dispatchers. The operations team notices that some requests are failing with 502 errors. Which THREE actions should be taken to troubleshoot the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review the ALB access logs to identify the target response codes.
Option A is correct because checking health checks can reveal if targets are unhealthy. Option C is correct because reviewing ALB access logs can show the response codes and target details. Option E is correct because checking security group rules ensures the ALB can communicate with the targets. Option B is incorrect because increasing idle timeout is not a direct fix for 502 errors. Option D is incorrect because disabling cross-zone load balancing does not affect 502 errors.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Disable cross-zone load balancing to isolate the issue.
Why it's wrong here
Cross-zone load balancing distributes traffic evenly; disabling it does not resolve 502 errors.
✗
Increase the idle timeout setting on the ALB.
Why it's wrong here
Idle timeout affects connection persistence, not 502 errors.
✓
Review the ALB access logs to identify the target response codes.
Why this is correct
Access logs provide detailed information about the requests and responses.
Related concept
Static NAT maps one inside address to one outside address.
✓
Verify the security group rules for the ALB and the target instances.
Why this is correct
Incorrect security group rules can block traffic, causing 502 errors.
Related concept
Static NAT maps one inside address to one outside address.
✓
Check the health check configuration and target group health status.
Why this is correct
Unhealthy targets can cause 502 errors.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Operations and Maintenance — This question tests Operations and Maintenance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Review the ALB access logs to identify the target response codes. — Option A is correct because checking health checks can reveal if targets are unhealthy. Option C is correct because reviewing ALB access logs can show the response codes and target details. Option E is correct because checking security group rules ensures the ALB can communicate with the targets. Option B is incorrect because increasing idle timeout is not a direct fix for 502 errors. Option D is incorrect because disabling cross-zone load balancing does not affect 502 errors.
What should I do if I get this PAS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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