What can port monitoring watch?

Any service that accepts a TCP connection: SMTP, POP3, IMAP, FTP, a database, a cache, or a game server, on whatever port it uses.

How is port monitoring different from uptime monitoring?

Uptime monitoring makes an HTTP request to a website. Port monitoring opens a raw TCP connection to a specific port, so it can watch services that have no web page.

TCP port monitoring

Monitor any TCP service, not just the web

PageWarden opens a raw TCP connection to the port you choose and reports up or down on connectivity. Watch SMTP, POP3, IMAP, FTP, a database, or a game server, the services a website check never sees. On Hobby and up.

Start monitoring free

Free plan, no credit card. 3-day trial on any paid plan.

PageWarden monitor detail for a website, showing current status, 24-hour, 7-day and 30-day uptime, SSL certificate and domain expiry, and checks from six regions. — Everything one monitor is watching

What it checks

Connectivity on any port

Point a monitor at a host and port and PageWarden checks that the service accepts a connection. Up when it connects, down when it does not.

Mail, databases, caches, game servers: if it speaks TCP, PageWarden can watch it.

Works with any TCP port

tcp example.com:587open

connected in 38ms

Beyond HTTP

The services a website check ignores

Plenty of critical infrastructure has no web page. A port monitor tells you your mail server or database is reachable, so an outage there does not go unnoticed.

See your port monitors alongside everything else on one board.

PageWarden dashboard listing eight website monitors with live up and down status, per-monitor 24-hour uptime bars, active incident count, and average response time. — The PageWarden status board

Port alerts

Told when a port stops answering

Connectivity warnings and recoveries go to email on every plan, and to Slack, Discord, Telegram and webhooks on paid plans.

Slack, Discord, Telegram and webhooks on paid plans

Your site checkout.acme.io has an issue

The uptime check on https://checkout.acme.io just failed.

What happened: HTTP 503 Service Unavailable
When: 2026-06-18 14:32 UTC

View site

Quick setup

Set up port monitoring in two minutes

Enter a host and a port and PageWarden checks the connection. No agent, nothing to install.

Add host and port

Enter the hostname and the TCP port you want watched, for example your mail or database port.

Set the interval

Choose how often to check, down to 60 seconds on Starter and Pro.

Route your alerts

Send warnings to email on any plan, or to Slack, Discord, Telegram and webhooks on a paid plan.

PLANS

TCP port monitoring is available on the Hobby plan and up.

See pricing

Questions

Port Monitoring, answered

More monitoring

Other things PageWarden watches

Uptime MonitoringPageWarden checks your site on a schedule, classifies every result up, degraded or down, and confirms a failure from multiple regions before it pages you. Uptime monitoring is on every plan, including Free.See how it works SSL Certificate MonitoringPageWarden tracks your certificate expiry and validates the chain on every check, so you hear about a problem days ahead, not from a customer looking at a browser warning. SSL monitoring is on every plan, including Free.See how it works Domain Expiry MonitoringPageWarden tracks your domain registration through WHOIS and warns you well before it lapses. The classic silent outage is a forgotten renewal, and this is how you avoid it. On every plan, including Free.See how it works Keyword MonitoringPageWarden reads the page body and checks that specific text is present, or absent. It is an uptime check that looks past the status code, so you catch a broken checkout, a leaked error string, or a defacement. On Hobby and up.See how it works DNS MonitoringPageWarden resolves your DNS records and checks they return what you expect. Watch A, AAAA, CNAME, MX, TXT and NS records, with an optional expected value, so a bad change or a hijack does not go unnoticed. On Hobby and up.See how it works Ping MonitoringPageWarden tests raw host reachability over ICMP, with no port and no HTTP. It separates a host being down from a service being down, and it is loss-aware. Ping runs from the prober regions. On Starter and up.See how it works All featuresThe full tour of everything PageWarden monitors.Browse features

Watch the services behind the website