Monitor Network Services
Ensure your TCP/UDP services are always accessible. Monitor databases, mail servers, game servers, and any service running on specific ports.
Port Status Monitor
Monitor Any Service, Any Port
TCP & UDP Support
Monitor both TCP and UDP ports for complete network service coverage.
Multiple Protocols
Monitor HTTP, HTTPS, FTP, SMTP, MySQL, PostgreSQL, Redis, and custom ports.
Connection Timing
Track connection establishment time and identify network latency issues.
Port State Alerts
Get notified when ports become unreachable or response time degrades.
Security Monitoring
Detect unauthorized port openings or unexpected service changes.
Historical Data
Track port availability over time and identify patterns in outages.
Commonly Monitored Services
Database Servers
3306
5432
27017
6379
Mail Servers
25
587
143
110
Web Services
80
443
8080
3128
File Transfer
21
22
990
445
Game Servers
25565
27015
9987
Custom
Remote Access
22
3389
5900
23
Who Needs Port Monitoring?
System Administrators
Keep track of all services across your infrastructure. Detect when services crash or become unreachable before users report issues.
Game Server Operators
Ensure your game servers are always online. Monitor multiple servers and get instant alerts when players can't connect.
DevOps Teams
Monitor database connections, message queues, and microservices. Identify connectivity issues before they cause cascading failures.
Security Teams
Monitor for unexpected port openings that could indicate security breaches. Track port status changes over time.
AlertSleep vs. Other Port Monitoring Solutions
Compare AlertSleep's TCP port monitoring with manual scripts and competing tools.
| Feature | AlertSleep | UptimeRobot | Custom cron script |
|---|---|---|---|
| Free plan | ✓ 5 monitors | ✓ 50 monitors | Free (setup cost) |
| TCP port monitoring | ✓ | ✓ | ✓ |
| 1-minute check interval | ✓ Basic+ | 5 min (free) | ✓ |
| SMS alerts included | ✓ Basic+ | Extra cost | Manual setup |
| Status page | ✓ included | ✓ | ✗ |
Frequently Asked Questions
What is TCP port monitoring?
TCP port monitoring checks whether a specific port on your server is open and accepting connections. AlertSleep monitors ports like 3306 (MySQL), 5432 (PostgreSQL), 22 (SSH), 25 (SMTP) and alerts you instantly when they become unreachable.
Which ports can AlertSleep monitor?
AlertSleep can monitor any TCP or UDP port. Common use cases include database ports (MySQL 3306, PostgreSQL 5432, Redis 6379), web ports (HTTP 80, HTTPS 443), mail ports (SMTP 25, IMAP 143), and custom application ports.
How quickly will I be alerted when a port goes down?
On paid plans with 1-minute check intervals, AlertSleep detects port failures within 60 seconds and immediately sends alerts via email, SMS, Slack, or webhook.
Is port monitoring free?
Yes. AlertSleep's free plan includes up to 5 port monitors with 5-minute check intervals. Upgrade to a paid plan for 1-minute intervals and more monitors.
Can I monitor ports behind a firewall?
Port monitoring works by connecting to your server's public IP or hostname. If your port is behind a firewall or restricted to specific IPs, you may need to allowlist AlertSleep's monitoring IPs to ensure checks reach your server.
Start Monitoring Your Ports
Ensure all your services are accessible. Get started in minutes.
Start Free Monitoring