Monitor Critical Network Services
Port monitoring verifies that specific network services are listening and accepting connections. Check if SSH (port 22), MySQL (port 3306), SMTP (port 25), or any other TCP/UDP service is accessible and responding.
Key Features
Any Port
Monitor any TCP or UDP port from 1-65535 for custom services.
Connection Verification
Verify services accept connections and respond appropriately.
Common Services
Built-in support for SSH, FTP, SMTP, MySQL, PostgreSQL, and more.
Frequently Asked Questions
Monitor ports for critical services: Port 443 (HTTPS), 80 (HTTP), 22 (SSH), 3306 (MySQL), 5432 (PostgreSQL), 6379 (Redis), 25/587/465 (SMTP email), 21 (FTP), and any custom application ports. Each service uses specific ports—if the port closes, that service is down.
Ping checks if a server is reachable. Port monitoring checks if a specific service on that server is running and accepting connections. A server can respond to pings but have all service ports closed if applications crashed.
Yes. Database servers listen on specific ports (MySQL: 3306, PostgreSQL: 5432, MongoDB: 27017). Port monitoring confirms the port is open and accepting connections. If the database crashes or stops, the port closes and you get alerted immediately.
Common causes: service crashed, firewall rule changed, server rebooted without auto-start configured, resource exhaustion causing service shutdown, security software blocking ports, or configuration changes. Port monitoring catches all these scenarios.
Monitor only critical service ports. Monitoring every port creates noise and alert fatigue. Focus on ports that directly affect users or business operations: web servers, databases, email, APIs, and critical backend services.