ssh_check_nfs_connectivity

THE RISK

High Risk

Checking NFS connectivity involves executing network diagnostic commands on the OPNsense firewall (e.g., showmount, rpcinfo, or similar probes). This is an active operation that triggers external network interactions rather than a passive read, placing it in the Execute category.

From the tool's definition 'Check NFS connectivity from OPNsense' implies running a connectivity test/probe (e.g., ping, mount check, or network scan) from the firewall appliance

Documented attack patterns abuse exactly the kind of access ssh_check_nfs_connectivity gives an agent:

HOW TO CONTROL SSH_CHECK_NFS_CONNECTIVITY

PolicyLayer is an MCP gateway — it sits between your AI agents and OPNSense MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ssh_check_nfs_connectivity:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ssh_check_nfs_connectivity": {
      "limits": [
        {
          "counter": "ssh_check_nfs_connectivity_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

ssh_check_nfs_connectivity stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register OPNSense MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 196 OPNSense MCP Server tools →

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Go deeper

High-risk tools in OPNSense MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the ssh_check_nfs_connectivity tool do? +

Check NFS connectivity from OPNsense. It is categorised as a Execute tool in the OPNSense MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ssh_check_nfs_connectivity? +

Register the OPNSense MCP Server MCP server in PolicyLayer and add a rule for ssh_check_nfs_connectivity: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches OPNSense MCP Server. Nothing to install.

What risk level is ssh_check_nfs_connectivity? +

ssh_check_nfs_connectivity is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit ssh_check_nfs_connectivity? +

Yes. Add a rate_limit block to the ssh_check_nfs_connectivity rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block ssh_check_nfs_connectivity completely? +

Set action: deny in the PolicyLayer policy for ssh_check_nfs_connectivity. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides ssh_check_nfs_connectivity? +

ssh_check_nfs_connectivity is provided by the OPNSense MCP Server MCP server (vespo92/opnsensemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every OPNSense MCP Server tool call.

Deterministic rules across all 196 OPNSense MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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196 OPNSense MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT SSH_CHECK_NFS_CONNECTIVITY ON OPNSENSE MCP SERVER DOES

// THE RISK

// HOW TO CONTROL SSH_CHECK_NFS_CONNECTIVITY

// EXPLORE