CCSM Advanced VPN Troubleshooting Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  Adjust the Phase 2 lifetime on the Check Point gateway to match the peer's lifetime.

  Why this is correct

  Rekey failures often occur when Phase 2 lifetimes differ. The peer with the shorter lifetime initiates rekey; if the other peer rejects the proposal due to mismatched settings or timing, the tunnel drops. Aligning the Phase 2 lifetime values on both peers ensures that rekey negotiations succeed and the tunnel remains stable.

• ✗

  Disable Perfect Forward Secrecy (PFS) to prevent rekey failures.

  Why it's wrong here

  PFS is not typically the cause of rekey failures; it adds an extra DH exchange during rekey but does not inherently cause failures. Disabling PFS would reduce security and may not resolve the issue if the root cause is a lifetime mismatch. Moreover, PFS settings must match on both peers; if mismatched, it could cause failures, but the logs point to rekey failure, which is more commonly lifetime-related.

• ✗

  Enable 'Support IPsec rekey' in the VPN community's advanced settings.

  Why it's wrong here

  Check Point does not have a specific setting called 'Support IPsec rekey' in the VPN community. Rekeying is a standard part of IPsec and is enabled by default. The problem is not whether rekey is supported, but whether the parameters (like lifetime) are compatible.

• ✗

  Increase the Phase 1 lifetime to a higher value than the peer's Phase 2 lifetime.

  Why it's wrong here

  Phase 1 and Phase 2 lifetimes are independent. Increasing Phase 1 lifetime does not affect Phase 2 rekey failures. The issue is specifically with Phase 2 rekey, so Phase 1 adjustments are irrelevant and could cause other issues if Phase 1 expires unexpectedly.