What Is TCP Port Monitoring?

TCP port monitoring is the process of continuously checking whether a specific TCP port on a server is open, accepting connections, and responding within an acceptable timeframe.

Traditional website monitoring only checks HTTP/HTTPS endpoints, leaving your entire backend infrastructure unmonitored. TCP port monitoring fills this critical gap.

UptimeMonitorX's TCP port monitoring works by establishing a real TCP connection to the specified host and port at your chosen interval.

TCP Port Monitoring Features

Monitor Any Port, Any Service

Monitor any TCP port - MySQL (3306), PostgreSQL (5432), MongoDB (27017), SMTP (25/587), FTP (21), SSH (22), or custom application ports.

TCP Connection Verification

Establishes a real TCP connection to verify that the service is actively accepting connections, not just a simple ping.

Custom Timeout Configuration

Set connection timeout thresholds per monitor to match the expected behavior of each service.

Response Time Logging

Track TCP connection establishment times with millisecond precision over time.

Multi-Channel Instant Alerts

Receive instant notifications via Email, Slack, Telegram, Discord, or WhatsApp when a port becomes unreachable.

Incident Tracking & History

Maintain a complete incident history with precise downtime start time, duration, and recovery timestamp.

Configurable Check Intervals

Choose monitoring intervals from every 1 minute to every 60 minutes based on service criticality.

SLA Uptime Reports

Generate detailed SLA compliance reports showing uptime percentages, incident counts, and response time trends.

Common TCP Port Monitoring Use Cases

MySQL, PostgreSQL, MongoDB database servers - ensure your data layer is always reachable

SMTP and IMAP mail servers - verify email infrastructure is accepting connections

FTP and SFTP file transfer services - confirm endpoints are available

SSH remote access - make sure servers are accessible for administration

Redis and Memcached cache servers - detect cache layer failures

Custom application services on non-standard ports

Message queue services like RabbitMQ and Kafka

Docker container services - verify services are bound to expected ports

Frequently Asked Questions

Which TCP ports can I monitor?

You can monitor any valid TCP port from 1 to 65535 - MySQL (3306), PostgreSQL (5432), Redis (6379), SSH (22), and any custom port.

Does TCP monitoring require agent installation?

No. UptimeMonitorX performs TCP checks externally over the internet. No agent or software to install on your servers.

How is TCP monitoring different from ping monitoring?

Ping checks network reachability using ICMP. TCP monitoring checks whether a specific service on a specific port is accepting connections.

TCP PortMonitoring

What Is TCP Port Monitoring?