n8n-nodes-server-check

n8n community node for server monitoring. Check server connectivity via HTTP, TCP Port or DNS - no ICMP ping required (works even when ping is blocked).

Features

Server Check Node

Execute connectivity checks:

• HTTP(S) Check: Check if a server responds to HTTP/HTTPS requests (works with any status code)
• TCP Port Check: Check if a specific TCP port is open (ideal for VPN servers: 443, 500, 4500, 1194, 51820)
• DNS Resolve: Check if a domain can be resolved via DNS

Server Check Trigger Node

Trigger workflows based on server status:

• On Status Change: Trigger when server goes online/offline
• On Every Poll: Trigger on every poll interval
• Only When Offline: Trigger only when server is unreachable
• Only When Online: Trigger only when server is reachable
• On High Latency: Trigger when latency exceeds a threshold

Why not ICMP Ping?

Most servers and firewalls block ICMP ping. This node uses alternative methods that work in 99% of cases:

• HTTP requests work if any web service is running
• TCP port checks work for any open port
• DNS lookups work if the domain is resolvable

Installation

Community Nodes (Recommended)

1. Go to Settings > Community Nodes
2. Select Install
3. Enter @zurdai/n8n-nodes-server-check
4. Click Install

Manual Installation

npm install @zurdai/n8n-nodes-server-check

Usage Examples

HTTP Check

Check if a web server is responding:

• URL: https://example.com
• Method: GET
• Accept Any Status: true (200, 301, 401, 500 all count as "reachable")

TCP Port Check (VPN Server)

Check if a WireGuard VPN server is reachable:

• Host: vpn.example.com
• Port: 51820

DNS Check

Check if a domain is resolvable:

• Domain: example.com

Output Examples

HTTP Check Output

{
  "checkType": "http",
  "url": "https://example.com",
  "method": "GET",
  "reachable": true,
  "status": "online",
  "statusCode": 200,
  "statusMessage": "OK",
  "responseTimeMs": 145,
  "responseTime": "145 ms",
  "timestamp": "2024-01-15T10:30:00.000Z"
}

TCP Port Check Output

{
  "checkType": "tcp",
  "host": "vpn.example.com",
  "port": 51820,
  "reachable": true,
  "status": "online",
  "responseTimeMs": 23,
  "responseTime": "23 ms",
  "timestamp": "2024-01-15T10:30:00.000Z"
}

DNS Check Output

{
  "checkType": "dns",
  "domain": "example.com",
  "reachable": true,
  "status": "online",
  "resolvedIp": "93.184.216.34",
  "ipFamily": "IPv4",
  "responseTimeMs": 12,
  "responseTime": "12 ms",
  "timestamp": "2024-01-15T10:30:00.000Z"
}

License

MIT