CCSM Advanced VPN Troubleshooting Practice Question
A remote access VPN user authenticates successfully with a certificate, and IKE Phase 1 completes, but the tunnel drops immediately after Phase 2 starts. The gateway logs show that the user's certificate has been revoked. Which Check Point component should the administrator verify first to confirm the revocation status?
⚠ Common exam trap
The trap here is focusing on IKE proposal or client certificate presence when the log explicitly points to revocation, which is a certificate lifecycle issue rather than a negotiation parameter issue.
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 gateway's certificate revocation list (CRL) cache, to confirm whether the user's certificate serial number is listed as revoked.
A log entry stating the certificate is revoked means the gateway made a revocation decision during authentication. Before changing any IPsec parameters, the administrator should verify the gateway's CRL cache contains the user's serial number, ensuring the revocation data is current and the decision is valid.
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 gateway's certificate revocation list (CRL) cache, to confirm whether the user's certificate serial number is listed as revoked.
Why this is correct
When the log explicitly reports certificate revocation, the first thing to confirm is that the gateway's cached CRL actually contains the user's certificate serial number. This validates that the gateway received an up-to-date revocation list and that the revocation decision is based on correct data.
- ✗
The user's local certificate store, to confirm the user has not accidentally deleted the client certificate.
Why it's wrong here
A missing client certificate would cause the user to fail Phase 1 authentication, not a Phase 2 drop with a revocation message. Because IKE Phase 1 already completed and the log specifically cites revocation, the client certificate is clearly present and being used.
- ✗
The gateway's IKE Phase 2 encryption and hashing proposals, to confirm they match the client's proposal list.
Why it's wrong here
A proposal mismatch would produce a Quick Mode or Phase 2 negotiation failure with messages about no matching proposal, not a certificate revocation log. The reported symptom names revocation as the cause, so checking proposal parameters would not address the actual failure.
- ✗
The gateway's Visitor Mode settings, to confirm remote users are permitted to connect over port 443.
Why it's wrong here
Visitor Mode is used to allow remote access clients to connect over TCP 443 when UDP is blocked. Since the user already authenticated and completed Phase 1, connectivity to the gateway is working, so Visitor Mode configuration is not the cause of the post-Phase-1 revocation drop.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
About these practice questions
One of 219 original CCSM practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Check Point exam blueprint
This CCSM practice question is part of Courseiva's free Check Point 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 CCSM exam.