Help CentreMonitor Types
TCP Port — check if a port is open
A TCP port monitor checks whether a specific port on your server is open and accepting connections. This is useful for monitoring services that do not have a web interface — such as databases, mail servers, or custom applications.
How it works
Alive24x7 attempts to open a connection to the host and port you specify. If the connection succeeds, the monitor is UP. If the connection is refused or times out, the monitor is DOWN and an alert is sent.
Common services and their ports
| Service | Default port |
|---|---|
| MySQL / MariaDB | 3306 |
| PostgreSQL | 5432 |
| Microsoft SQL Server | 1433 |
| Redis | 6379 |
| SMTP (email sending) | 25 or 587 |
| SSH | 22 |
| RDP (Remote Desktop) | 3389 |
How to configure it
- Set the Monitor type to TCP Port.
- Enter the Host — the hostname or IP address of your server.
- Enter the Port number (1–65535).
TCP port monitoring only confirms that the port is open. It does not log in to the service or verify that the application is functioning correctly. For deeper checks, combine a TCP port monitor with an HTTP or Keyword monitor.
Plan availability
TCP port monitoring is available on Starter, Pro, and Team plans.