The issue occurred after a reboot, indicating that the problematic kernel parameters were made persistent. On Check Point gateways, kernel parameters are made persistent by adding them to the $FWDIR/boot/fwkern.conf file. The safest and most effective way to resolve the issue is to revert these changes. Restoring the fwkern.conf file from a recent, known-good backup will undo the incorrect modifications. A subsequent reboot is necessary to unload the currently running faulty kernel parameters and load the correct configuration from the restored file, returning the gateway to a stable operational state.

A. The fw ctl set int command modifies kernel parameters temporarily for the current session only; the changes would be lost on reboot and would not fix the underlying persistent configuration issue.

C. The fw unloadlocal command is used to unload the security policy from the Security Gateway. It has no effect on kernel parameters.

D. Removing all kernel parameters from fwkern.conf is a risky approach. It would remove the problematic changes but also any other necessary, pre-existing customizations, potentially causing new issues.

1. Check Point Support Center, sk26202: "Changing the kernel global parameters for Check Point Security Gateway". This document explicitly states: "To make the changes permanent (survive a reboot), you must add the desired kernel parameters and their values to the $FWDIR/boot/fwkern.conf file." This confirms that the problem lies within this file, and reverting the file is the logical solution.

2. Check Point R81.10 CLI Reference Guide, Page 411. This guide describes the fw unloadlocal command, stating its purpose is to "Unload the local Security Policy from a Security Gateway." This confirms the command is unrelated to kernel parameter management.

3. Check Point R81.10 CLI Reference Guide, Pages 238-239. This section details the fw ctl command, noting it is used for inspecting and modifying kernel data. Changes made via fw ctl set are not persistent across reboots, making it unsuitable for fixing a problem caused by a persistent configuration file.