Port Checks
Checks & Monitoring
Updated Apr 2, 2026
Port checks verify that a TCP or TLS service is accepting connections on a specific port.
Configuration
| Field | Description |
|---|---|
| Host | Hostname or IP address of the server. |
| Port | Port number (1–65535). |
| SSL/TLS | Enable to connect via TLS (TCPS). Disable for plain TCP. |
| Interval | 30s, 60s, 2m, 5m, 10m, 30m or 1h. |
How it works
The agent opens a TCP connection to the specified host and port. If the connection is established within the timeout window, the check is marked up. If the connection is refused, times out or fails, the check is marked down.
When SSL/TLS is enabled, a full TLS handshake is performed. Certificate details are captured, and SSL expiration alerts apply.
Common ports to monitor
| Service | Port | SSL |
|---|---|---|
| SSH | 22 | No |
| SMTP | 25 / 587 | 587 with STARTTLS |
| MySQL | 3306 | No |
| PostgreSQL | 5432 | No |
| Redis | 6379 | No |
| HTTPS | 443 | Yes |
| RDP | 3389 | No |
| MSSQL | 1433 | No |