CCSM Advanced VPN Troubleshooting Practice Question
A remote access user is unable to connect via Mobile Access VPN. The logs show 'IKE Phase 1 Main Mode negotiations failed'. Which action should be taken to isolate the issue?
⚠ Common exam trap
Candidates frequently try to view general system logs or SmartView Tracker, failing to realize that IKE negotiation details are only visible in the specific IKE debug files during the attempt.
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
✓
Review the $FWDIR/log/ike.elg file while initiating a new connection attempt.
IKE Phase 1 failures typically indicate a mismatch in pre-shared keys, encryption algorithms, or DH groups. By checking the ike.elg logs using 'vpn debug ikeon', an administrator can pinpoint exactly which proposal failed. This is critical because it distinguishes between authentication errors and policy mismatches, allowing for targeted remediation of the gateway or client settings rather than guessing at the root cause.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the timeout value for the Mobile Access portal in Global Properties.
Why it's wrong here
Timeout settings impact session duration and user experience once authenticated, but they do not influence the initial IKE Phase 1 negotiation process. Changing these settings will not resolve mismatches in security proposals or keys that prevent the tunnel from being established in the first place.
- ✓
Review the $FWDIR/log/ike.elg file while initiating a new connection attempt.
Why this is correct
The ike.elg log file records the low-level negotiation process of IKE packets. By viewing this file during a connection attempt, the administrator can identify specific mismatch errors, such as incorrect DH groups or hash algorithms, which are the primary reasons for Phase 1 failure.
- ✗
Disable Anti-Spoofing on the external interface to allow IKE packets.
Why it's wrong here
Anti-Spoofing is a critical security control that drops packets with forged source addresses. Disabling it is a dangerous practice that exposes the internal network to attacks and is rarely the cause of IKE negotiation failures, which are usually configuration-based rather than related to packet filtering.
- ✗
Update the CRL list on the Security Management Server.
Why it's wrong here
Certificate Revocation Lists are used for validating certificates during Phase 2 or user authentication. If the failure occurs in Phase 1, the IKE negotiation has not yet reached the point of validating peer identities via certificates or CRLs, rendering this action ineffective for this specific error.
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
About these practice questions
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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.