HTTP vs TCP vs Ping Monitoring: Which Check to Use

When a service stops responding, the first question is rarely "is it down?" It is "where did it break?" A ping check, a TCP check and an HTTP check each answer a different version of that question. Pick the wrong one and you will either miss real outages or get paged for alarms that were never real. This guide walks through HTTP vs TCP vs ping monitoring, what each check actually proves, and how to match them to the services you run.

What Ping Checks Actually Measure#

A ping check sends a small packet to a host and waits for a reply. That is the whole test. It answers one question: is this machine reachable on the network, and how long did the round trip take?

Ping is fast, cheap and universal. It is also the shallowest check you can run. A server can answer every ping in 12 milliseconds while the website running on it returns errors to every visitor. If your only monitor is ping, a broken web server still looks perfectly healthy.

Use ping when you care about the host itself: a load balancer, a VPN endpoint, or a bare server with no service on a known port.

What TCP Checks Actually Measure#

A TCP check opens a connection to a specific port: 443 for HTTPS, 5432 for PostgreSQL, 3306 for MySQL, 22 for SSH. It confirms that something is listening and accepting connections on that port.

This moves you one layer closer to your application than a ping. You are no longer asking whether the machine is up, but whether the service is reachable.

The limit is that a port can accept a connection and still be broken. A database port will complete the handshake while every query behind it times out. A TCP check tells you the door is open. It cannot tell you what is happening inside the room.

What HTTP Checks Actually Measure#

An HTTP check makes a real request and reads the response: status code, response time, page weight, and whether the content matches what you expect.

This is the closest a monitor gets to what your users experience. It is also the most specific. An HTTP check can verify a 200 status, assert that a keyword appears in the body, follow redirects, and measure how long the full page took to load.

For anything a person or a client actually visits, HTTP is the check that matters. It is the only one of the three that fails when your application fails.

Matching Check Types to the Services You Run#

The right choice follows the thing you are protecting, not the check you happen to like.

Public websites and landing pages: HTTP. It confirms the page renders and returns the status you expect, not just that the server answered.

APIs: HTTP with a content assertion. The status code alone is not enough. A healthy-looking 200 that returns an error message will pass a naive check and fail your users. Assert on a keyword or a JSON field.

Databases and message brokers: TCP. You want to know the port is accepting connections. Deeper query checks belong in your application tests, not your uptime monitor.

Bare hosts, load balancers and network gear: ping. There is no port or page to check, so reachability is the whole question.

SSL certificates and domain expiry: neither of the above. Those need their own check with its own lead time, so a certificate does not quietly expire on a weekend.

Combining Checks to Confirm Real Downtime#

One check type is a signal. Two or three together are a verdict.

The most common reason teams stop trusting their monitoring is false alarms: a single failed check from a single location, fired the moment a network blip happens. The fix is correlation.

When an HTTP check fails, a TCP check to the same host tells you whether the problem is the port or the application. A ping check tells you whether the host is reachable at all. Run those checks from more than one region, and confirm the failure before you page anyone. A real outage fails everywhere. A blip fails once.

That is the difference between a monitor you act on and a monitor you mute.

How PulseKeeper Covers All Three#

PulseKeeper runs HTTP, API, TCP and ping checks side by side, alongside cron heartbeats and SSL and domain expiry monitoring, from three regions. It verifies a failure across regions before it alerts you, and it correlates response time and page weight with your deploys, so you can see which release made the page heavier, not just that it got slower.

One product, every check type, one place to look. You pick the right check per service without stitching together three separate tools.

The Short Version#

Ping checks reachability. TCP checks a port. HTTP checks your application. Each answers a narrower, more useful question than the one before it.

Match the check to the service: HTTP for pages and APIs, TCP for databases, ping for bare hosts, and a separate check for certificates and domains. Run them together, from more than one region, and confirm before you alert.

Get that combination right and you catch real downtime while keeping the false alarms out. That is what HTTP vs TCP vs ping monitoring comes down to: not choosing one check, but choosing the right check for each thing you run.