PAS-C01 Technology Practice Question
A company runs SAP S/4HANA on AWS using a multi-ABAP application server setup with a central services instance (ASCS) and enqueue replication. After a recent OS patching, the secondary application server fails to start, with errors indicating it cannot connect to the enqueue replication server (ERS). The ERS process is running on the ASCS instance. The network team confirms that security groups and NACLs are properly configured. Which THREE steps should be taken to resolve this issue? (Choose three.)
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
✓
Check the SAP instance profile for the enqueue replication parameters (e.g., rdisp/enq_repl_server).
The SAP instance profile on the secondary application server may have lost or misconfigured the enqueue replication parameters (e.g., rdisp/enq_repl_server) during the OS patching, which would prevent it from connecting to the ERS. Option C is correct because the ERS process (enre) must be running on the ASCS instance and listening on the correct port; if it stopped or changed ports after patching, connectivity fails. Option D is correct because the secondary application server needs to resolve the ERS hostname correctly via DNS or /etc/hosts; patching may have altered hostname resolution. Option A is incorrect because changing the instance type does not address connectivity to the ERS; the issue is network or configuration, not sizing. Option E is incorrect because the SAP kernel version is unlikely to change due to OS patching, and updating the kernel is not a standard troubleshooting step for this specific ERS connection issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the secondary application server instance type to a larger size.
Why it's wrong here
Instance type change does not fix connectivity.
- ✓
Check the SAP instance profile for the enqueue replication parameters (e.g., rdisp/enq_repl_server).
Why this is correct
Profile parameters define ERS connection details.
- ✓
Confirm that the ERS process (enre) is running on the ASCS instance and is listening on the correct port.
Why this is correct
The ERS service must be active.
- ✓
Verify that the DNS or /etc/hosts file on the secondary application server resolves the ERS hostname correctly.
Why this is correct
Hostname resolution is critical for SAP communication.
- ✗
Update the SAP kernel on the secondary application server to the latest version.
Why it's wrong here
Kernel update is unrelated to connectivity after patching.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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