TCP monitors

Check that a TCP port accepts connections — for databases, brokers and anything that isn't HTTP.

A TCP monitor opens a connection to a host and port and reports success if the connection is accepted within the timeout.

Configuration

Everything else — interval, timeout, retries, regions, confirmations — is shared with all monitors.

What it does and does not tell you

A successful TCP check proves the port is open and something accepted the connection. It does not prove the service behind it is healthy: a database that has run out of connections, or is stuck replaying a log, will usually still complete a TCP handshake.

Use TCP when there is no richer check available. When the service speaks HTTP, an HTTP monitor with an assertion tells you far more.

Common uses