- A
The DNS resolution is incorrect for the web service hostname.
Why wrong: Ping works, so DNS resolution is functional.
- B
The SAP router configuration is blocking the connection.
Why wrong: SAP router is used for SAP-specific communication, not generic HTTP.
- C
The SSL certificate of the web service has expired.
Why wrong: SSL expiration would cause a certificate error, not a timeout.
- D
A firewall between the application server and the web service is blocking the required port.
Firewall rules may block the specific port while allowing ICMP.
Question 93 of 1,733
Troubleshooting SAP RFC Call Timeouts Due to Firewall Rules
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 system uses a custom RFC destination to an external SOAP web service. After a recent network change, the RFC call fails with a timeout error. The SAP administrator has verified that the web service is reachable from the SAP application server using ping. What is the MOST likely cause of the timeout?
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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A firewall between the application server and the web service is blocking the required port.
Option D is correct because the RFC call uses a specific port (e.g., 443 for HTTPS or 80 for HTTP) to communicate with the SOAP web service. A firewall blocking that port would cause a timeout, as the ping test (ICMP) succeeds but the TCP handshake on the required port fails. The SAP administrator's verification of reachability via ping only confirms ICMP-level connectivity, not application-layer port access.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 DNS resolution is incorrect for the web service hostname.
Why it's wrong here
Ping works, so DNS resolution is functional.
- ✗
The SAP router configuration is blocking the connection.
Why it's wrong here
SAP router is used for SAP-specific communication, not generic HTTP.
- ✗
The SSL certificate of the web service has expired.
Why it's wrong here
SSL expiration would cause a certificate error, not a timeout.
- ✓
A firewall between the application server and the web service is blocking the required port.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse ICMP reachability (ping) with TCP port-level connectivity, assuming that if a server responds to ping, all network paths are open.
Detailed technical explanation
How to think about this question
RFC destinations to external SOAP web services use HTTP/HTTPS protocols over TCP, typically on ports 80 or 443. A firewall blocking these ports prevents the TCP three-way handshake from completing, resulting in a connection timeout (default often 60 seconds). Ping uses ICMP, which is a different protocol and is often allowed through firewalls separately, creating a false sense of connectivity.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A firewall between the application server and the web service is blocking the required port. — Option D is correct because the RFC call uses a specific port (e.g., 443 for HTTPS or 80 for HTTP) to communicate with the SOAP web service. A firewall blocking that port would cause a timeout, as the ping test (ICMP) succeeds but the TCP handshake on the required port fails. The SAP administrator's verification of reachability via ping only confirms ICMP-level connectivity, not application-layer port access.
What should I do if I get this PAS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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