> Source: [sk111301](https://support.checkpoint.com/results/sk/sk111301)

# sk111301 - Cannot access Internet with Endpoint Security Firewall blade turned on, when Zscaler Client also installed on the machine

| Property | Value |
|----------|-------|
| Solution ID | sk111301 |
| Date Created | 2016-05-08 |
| Last Modified | 2016-05-10 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | Cloud, E89.X, E88.X |

## Symptoms

- Cannot access the Internet with Endpoint Security Firewall blade turned on, when Zscaler Client is also installed on the machine.

## Cause

The Zscaler Client is installed on the machine and causes the Endpoint Security Firewall blade to block access to the Internet, when turned on.

The Zscaler Client uses a built-in cloud-based firewall, as part of an add-on. When the Zscaler Client is enabled, it blocks traffic on the machine.

## Solution

This solution requires authentication. Please log in to view the full solution.

---

# Agent Instructions

This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products.

## Navigating This Knowledge Base

- **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt)
- **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml)
- **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}`
- **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content