Is the service actually listening? TCP port reachability, watched 24/7.
TCP port checks from PingForce’s 2 US monitor locations. SMTP, SSH, databases, queues, custom services — confirmed across 3 checks before you’re paged.
A host can be up while the service is down.
Ping says the box is alive, HTTP says the website loads — and meanwhile your SMTP relay is refusing connections, your database can’t accept new clients, or a queue worker quietly stopped listening. Port Monitoring asks the simpler question that catches all of it: is the service answering on its port?
One question, asked on a schedule.
TCP reachability, any port
Confirm a TCP connection can be established to the host and port. The service answers, or it doesn’t.
Built for the usual suspects
SMTP on 25, SSH on 22, MySQL on 3306, Postgres on 5432, Redis on 6379 — and anything else listening on TCP.
Configurable interval
Every 1, 5, 10, 15, or 30 minutes. 1-minute on paid plans; the free Specialist tier is 5-minute minimum.
3-check confirmation + alerts
Three consecutive failures open an incident. Three clean checks close it. Email, SMS, Slack, Teams, or webhook.
The evidence is captured at the moment of failure.
When your monitor catches a problem, our global probe network fires automatically on the third failed check — so when your engineer gets the alert, the forensic data is already attached.
Your service
Starts returning errors.
Monitor detects
3 consecutive failed checks.
Global probes fire
40+ locations check at once.
Evidence delivered
Situation report attached to the incident.
The verification runs the moment the issue is happening — not 5 minutes later when you’re trying to reproduce it. A situation report with the regions, routes, and response codes is attached to the incident in your dashboard before your engineer even opens the alert. The first question — “where is this happening?” — is already answered.
Port watch in three steps.
Enter host and port
e.g. your mail server on 25, database on 5432, or any TCP service.
Set your interval
1-minute on paid tiers, down to 30-minute.
Choose alerts & save
We tell you the instant the port stops accepting connections.
Watch the port,
not just the homepage.
Free forever tier. Setup in 5 minutes. No credit card.