# Outbound Network Firewall Validator MCP for AI Agents MCP

> Outbound Network Firewall Validator prevents your AI agents from making unauthorized network requests. It checks URLs against an allowlist and blocks private IP ranges to stop data exfiltration and SSRF attacks before they happen.

## Overview
- **Category:** security
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/vk_preview_fpnsy0fbASRET1Eokbs7pfHG4er3IuaODZ00pFdF/mcp
- **Tags:** security, network, firewall, ssrf, validation, protection

## Description

When you give an agent access to the web, you are essentially opening a door to your internal network. Without controls, that agent might accidentally or maliciously reach out to sensitive internal servers or unauthorized third-party sites. This MCP acts as a gatekeeper for every outbound request your client attempts to make. It inspects URLs and IP addresses against your specific security policies, ensuring that only approved destinations are reachable. By using the Vinkius catalog, you can instantly add this layer of network defense to any compatible agent without managing complex firewall rules yourself. You get peace of mind knowing that even if an agent is tricked by a prompt injection, it cannot leak data to a private IP or an unapproved domain.

## Tools

### validate_outbound_request
Checks a specific URL against your predefined security policies. It returns a simple pass or fail based on your rules.

### check_domain_membership
Verifies if a hostname is part of your approved list. This helps keep agent traffic restricted to trusted partners.

### evaluate_ip_risk
Analyzes an IPv4 address to determine its potential threat level. It identifies if an IP belongs to a sensitive or private range.

## Prompt Examples

**Prompt:** 
```
Is `https://api.github.com/repos/mcpfusion/core` allowed?
```

**Response:** 
```
Yes, `api.github.com` is on your approved list of domains.
```

**Prompt:** 
```
Check if `http://192.168.1.50:8080` is safe.
```

**Response:** 
```
No, this request is blocked because 192.168.1.50 belongs to a private IP range.
```

**Prompt:** 
```
Can my agent access `sub.mysite.org`?
```

**Response:** 
```
Yes, that hostname matches your authorized `mysint.org` suffix.
```

## Capabilities

### Block unauthorized outbound URLs
Stops your agent from reaching any website not on your approved list.

### Prevent SSRF attacks
Blocks requests aimed at internal infrastructure or sensitive metadata services.

### Enforce domain allowlists
Restricts agent browsing to only the specific hostnames you trust.

### Identify risky IP addresses
Flags IPv4 addresses that belong to private or dangerous ranges.

### Audit network request destinations
Provides a way to verify where your agent is attempting to send data.

## Use Cases

### Preventing SSRF
An agent tries to fetch data from a local metadata service, but the MCP blocks the request to protect your cloud environment.

### Restricting Web Scraping
You want an agent to only scrape news sites, so it automatically fails when it attempts to visit an unapproved blog.

### Securing API Integrations
An agent is tasked with calling a third-party API, and the MCP ensures it does not deviate to a malicious clone.

## Benefits

- Stop data leaks by blocking requests to unapproved domains using validate_outbound_request.
- Protect internal servers from being reached via evaluate_ip_risk checks on private IP ranges.
- Restrict agent browsing to trusted sites only with check_domain_membership verification.
- Reduce the attack surface of your automated workflows by enforcing strict outbound rules.
- Automate network security policy enforcement without manual firewall configuration.

## How It Works

The bottom line is that you stop unauthorized network egress at the source.

1. Connect the MCP to your preferred AI client via Vinkius.
2. Define your allowed domains and restricted IP ranges in your configuration.
3. Your agent automatically checks every outbound URL against these rules before sending the request.

## Frequently Asked Questions

**How does Outbound Network Firewall Validator prevent data leaks?**
It checks every URL your agent tries to reach against a list of approved domains and blocks any attempt to access private IP addresses.

**Can I use Outbound Network Firewall Validator with Claude?**
Yes, you can connect this MCP to any compatible client like Claude or Cursor to secure their outbound requests.

**Does Outbound Network Firewall Validator stop SSRF attacks?**
It specifically targets SSRF by blocking requests to internal infrastructure and private IP ranges that an attacker might try to exploit.

**How do I configure allowed domains in Outbound Network Firewall Validator?**
You define your allowlist within the MCP configuration, which the agent then uses to validate every outbound request.

**Will Outbound Network Firewall Validator slow down my agent?**
The validation happens almost instantly, adding negligible latency to your network requests.

**How does it prevent SSRF?**
It blocks private IP ranges like 127.0.0.1 using bitwise math to ensure agents cannot access internal infrastructure.

**Can I use it for subdomains?**
Yes, if you allow `mysite.org`, then `api.mysite.org` is also authorized via suffix matching.

**What happens if a URL is invalid?**
The `validate_outbound_request` tool will return an error state and the reason for failure.