TCP
Overview
Section titled “Overview”The TCP monitor checks that a specific port is open and accepting connections on a server. It’s useful for monitoring services that aren’t reachable over HTTP, like databases, mail servers, or custom services.
Settings
Section titled “Settings”| Setting | Description | Default |
|---|---|---|
| Host | IP address or hostname | — |
| Port | TCP port number | 443 |
| Interval | Check frequency | shortest your plan allows |
| Timeout | Fixed check budget (not configurable) | 5s |
Use cases
Section titled “Use cases”- Databases — PostgreSQL (5432), MySQL (3306), Redis (6379).
- Mail servers — SMTP (25/587), IMAP (993), POP3 (995).
- Other services — SSH (22), FTP (21), or any custom port.
How it works
Section titled “How it works”The monitor opens a TCP connection to the given host and port. The check succeeds if the connection is established within the timeout. No data is sent after connecting — only the socket opening is tested.
Metrics
Section titled “Metrics”TCP connection time is recorded on every check, letting you track network latency to your services over time.