The answer is a redirect configuration mismatch, specifically that the web dispatcher is set to redirect HTTP requests to HTTPS while the ALB health check is using HTTP. This is the most likely reason for the SAP web dispatcher health check redirect issue because the Application Load Balancer expects a 200 OK response from the /sap/public/health endpoint to consider the target healthy; a 3xx redirect response, such as a 301 or 302, is interpreted as a failure, even though the web dispatcher itself is running and reachable directly. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how ALB health checks interact with SAP web dispatcher configurations—a common trap is assuming a security group or instance resource issue when the real problem is an HTTP-to-HTTPS redirect breaking the health check logic. Remember the memory tip: “A redirect is not a success—health checks need a 200, not a 302.”
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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.
An SAP environment on AWS consists of several EC2 instances running SAP NetWeaver and a separate HANA database instance. The system is using an Application Load Balancer (ALB) to distribute traffic to the web dispatchers. Recently, the ALB health checks are failing for one of the web dispatchers, causing it to be taken out of service. You investigate and find that the web dispatcher is running and can be reached directly via its private IP. The health check is configured to check the /sap/public/health endpoint. What is the most likely reason for the health check failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The web dispatcher is configured to redirect HTTP requests to HTTPS, and the health check is using HTTP.
Option A is correct because the health check endpoint must return a 200 OK response. If the web dispatcher returns a redirect (3xx) to a login page, the ALB considers it unhealthy. Option B (security group) would affect direct access as well. Option C (instance size) is unrelated. Option D (multiple IPs) is not typical for a single instance.
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.
✗
The security group for the web dispatcher does not allow traffic from the ALB.
Why it's wrong here
If direct access works, the security group is likely correct.
✓
The web dispatcher is configured to redirect HTTP requests to HTTPS, and the health check is using HTTP.
Why this is correct
A redirect response (3xx) is considered unhealthy by ALB; the health check should use HTTPS or the web dispatcher should not redirect.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The web dispatcher instance is running out of memory, causing slow responses.
Why it's wrong here
Slow responses could cause timeout, but the stem says direct access works.
✗
The web dispatcher has multiple IP addresses and the health check targets the wrong one.
Why it's wrong here
Multiple IPs are not typical; health check targets the instance's private IP.
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.
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The web dispatcher is configured to redirect HTTP requests to HTTPS, and the health check is using HTTP. — Option A is correct because the health check endpoint must return a 200 OK response. If the web dispatcher returns a redirect (3xx) to a login page, the ALB considers it unhealthy. Option B (security group) would affect direct access as well. Option C (instance size) is unrelated. Option D (multiple IPs) is not typical for a single instance.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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