PAS-C01 Migration Practice Question
During a migration of an SAP system to AWS, the SAP application team reports that batch jobs are failing with an error 'RFC connection refused'. The on-premises system and AWS are connected via a VPN. What is the MOST likely cause?
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
✓
The security group attached to the SAP instance does not allow inbound RFC traffic
Security groups act as a virtual firewall for EC2 instances, controlling inbound and outbound traffic. If the security group for the SAP instance does not allow inbound RFC traffic (e.g., on ports 3300 or 3200 for SAP RFC), connections will be refused. Option B (VPN bandwidth) would cause timeouts or slow transfers, not immediate connection refusal. Option C (network ACLs) operates at the subnet level and stateless; they could block RFC ports, but since the error is specifically 'RFC connection refused' and it's a common misconfiguration, security groups are more likely the culprit. Option D (route table) is for routing traffic between networks; if there were no route to on-premises, traffic would not reach AWS at all, rather than being refused.
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 attached to the SAP instance does not allow inbound RFC traffic
Why this is correct
Security group rules control inbound traffic to the instance.
- ✗
The VPN bandwidth is insufficient causing timeouts
Why it's wrong here
Insufficient bandwidth would cause timeouts, not immediate refusal.
- ✗
The network ACLs are blocking the RFC ports
Why it's wrong here
NACLs are stateless and might be an issue, but SGs are more likely.
- ✗
The route table does not have a route to the on-premises network
Why it's wrong here
Would cause 'destination unreachable', not 'connection refused'.
Visual reference
Go deeper
Related to this question
About these practice questions
Courseiva writes every PAS-C01 question from scratch — 1,616 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.