Check Point SecureXL Drops: fwaccel stat When tcpdump Sees It and Policy Does Not

Check Point · Techclick CLI troubleshooting lab

tcpdump on the NIC sees the packet. fw monitor is empty. No accept, no drop in logs.

This is a live-ticket style lesson from Techclick Infosec. You will isolate the fault with CLI first, then prove the fix with one clean packet or log.

What you will be able to do

• Name the first CLI command to run on Check Point for this ticket

• Separate the layer that is actually broken from the layer people blame

• Apply one scoped fix instead of a global disable

• Prove the ticket closed with a session, log, or counter

Quick answer

SecureXL may accelerate or drop before the inspection path you are watching. fwaccel stat and templates tell you.

Why this ticket shows up

Accelerated packets skip some inspect points. A bad acceleration decision looks like a ghost drop.

Symptoms operators actually see

• Wire has the packet, logs do not

• Templates exist for the flow

• Started after enabling acceleration features

• Asymmetric routing

CLI first — copy this block

Run these on the Check Point device or console named in the ticket. Do not skip the first show command — it tells you which later command matters.

fwaccel stat
fwaccel templates
fwaccel conns | grep 10.8.8.8
fw ctl fast_accel show
fwaccel stats -s

How to read that output

If a connection is fully accelerated, your fw monitor filter might miss it. stats -s shows drops inside SecureXL.

Triage order

1. fwaccel stat

2. Find the connection in conns/templates

3. For the test, disable acceleration on that flow or globally

4. Reproduce and capture

5. Re-enable acceleration

Classic traps

What you see	Real cause	Fix
Leave SecureXL off	It was a visibility issue	Turn it back on
Add accept rules	Packet never hit rulebase	Fix acceleration/path
Blame the app	NIC saw the SYN only	Return path issue

Proof the ticket is closed

• You see accept or a named drop

• Acceleration is back on

• App works or has a documented drop reason

Say this in an interview

If the NIC sees a packet and the rulebase does not, I look at SecureXL before I rewrite policy.

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