Application-Layer Health Validation
Verify services are actually accepting connections, not just that servers are online. Catch application hangs and resource exhaustion before users hit broken services.
TCP port monitoring goes beyond basic connectivity to validate that your critical services are ready to handle requests and process data.
Monitor the actual service endpoints your applications depend on, ensuring they're responsive when your users need them most.
Critical Infrastructure Protection
Monitor databases, caches, message queues - the backbone services users never see but always need. Detect when core services stop responding even if the server appears healthy.
Essential infrastructure components often fail silently while the host system continues running normally, leaving applications unable to function properly.
Proactive monitoring of these critical services prevents cascading failures and ensures your entire stack remains operational.
Port-Specific Intelligence
Monitor multiple services per server independently (ie: database on 3306, Redis on 6379, SSH on 22). Identify which specific service failed during incidents.
Server outages often affect only specific services, making granular monitoring essential for accurate diagnostics and efficient troubleshooting.
Precise service-level monitoring eliminates guesswork during incidents and enables targeted remediation efforts.
Connection Performance Insights
Track TCP handshake times to detect network congestion or service overload. Spot degrading performance before they become timeouts.
Connection timing patterns reveal developing infrastructure problems long before they impact user experience or cause service failures.
Use performance trends to make informed decisions about scaling, load balancing, and infrastructure optimization.
Zero-Configuration Service Discovery
Monitor any TCP service without installing agents or modifying applications. Works with legacy systems, third-party services, and black-box infrastructure.
No need to modify existing applications or install monitoring agents that consume resources and require maintenance.
External monitoring approach ensures you can validate services from the same perspective as your users and dependent systems.
Dependency Chain Monitoring
Verify external APIs, partner services, and cloud providers are reachable. Monitor the services your applications depend on but you don't control.
Third-party service failures can bring down your entire application stack, making external dependency monitoring critical for reliability.
Early detection of your partner service issues allows you to implement fallbacks or notify users before they encounter problems.
Security and Compliance Validation
Confirm services are only accessible from expected networks. Verify internal services aren't exposed externally.
Security misconfigurations can accidentally expose sensitive services to the public internet, creating serious vulnerabilities.
Regular validation from different network locations ensures your security policies are properly implemented and maintained.
Real-World Service Availability
Security-First Monitoring
Monitor your most sensitive services and internal infrastructure safely by restricting access to Oh Dear's fixed IP addresses only. No need to expose services publicly for monitoring.
Configure your firewalls, security groups, and access control lists to allow connections exclusively from Oh Dear's monitoring servers, maintaining your security posture while ensuring comprehensive monitoring coverage.
Our static IP addresses never change, providing stable security rules that won't break over time. Monitor databases, internal APIs, and critical infrastructure without creating security vulnerabilities.
- Get our complete list of static IP addresses for secure monitoring. Perfect for firewall rules and security group configurations. View our IP addresses.
Stop worrying, start monitoring
Start a no-strings-attached 10-day free trial. You're all set in less than a minute. (No credit card needed.)
Not convinced yet? Need help? Get in touch via [email protected].
Service monitoring to the next level
Be confident that your services are available and and only available for the right people.
Complete your monitoring strategy
TCP port monitoring complements ping monitoring by validating service-level availability after network connectivity is confirmed.
Use ping monitoring to verify basic network connectivity, then TCP monitoring to ensure specific services are responding on their designated ports.
This layered approach provides comprehensive infrastructure monitoring, from network layer connectivity to application service availability.
| Service | Value |
|---|---|
| Postgres | available on port 5432 |
| Redis | available on port 6379 |
Redis service is publicly accessible
Redis service is publicly accessible
Verified from Paris, France and Frankfurt
Redis service is publicly accessible
Messages
Postgres service is publicly accessible. full report: https://app.opsgenie.com/monitors/83/checks/411
Messages
Redis service is publicly accessible. verified from Paris, France and Frankfurt
Messages
Services monitoring has been successfully enabled. We'll notify you when something goes wrong.
Messages
Postgres service is publicly accessible. full report: https://app.opsgenie.com/monitors/83/checks/411
Messages
Redis service is publicly accessible. verified from Paris, France and Frankfurt
Messages
Services monitoring has been successfully enabled. We'll notify you when something goes wrong.
$_TOKEN="your API token" $ curl -X GET "https://notifyservicexyz.com/api/alert/urlxyzcom" \ -H "Authorization: Bearer $_TOKEN" \ -H "Accept: application/json" \ -H "Content-Type: application/json"
Opsgenie
Postgres service is publicly accessible. full report: https://app.opsgenie.com/monitors/83/checks/411
Opsgenie
Redis service is publicly accessible. verified from Paris, France and Frankfurt
Opsgenie
Services monitoring has been successfully enabled. We'll notify you when something goes wrong.
PagerDuty
Postgres service is publicly accessible. full report: https://app.opsgenie.com/monitors/83/checks/411
PagerDuty
Redis service is publicly accessible. verified from Paris, France and Frankfurt
PagerDuty
Services monitoring has been successfully enabled. We'll notify you when something goes wrong.
Reverse Monitoring & Compliance
Monitor services that should remain hidden for compliance and security reasons. Get immediate alerts when internal databases, staging APIs, or sensitive service ports accidentally become publicly accessible via TCP connections.
Compliance violations often occur when supposedly isolated services become reachable due to configuration errors, firewall changes, or security misconfigurations that expose internal service ports.
Set up reverse monitoring to ensure your sensitive services maintain their intended isolation and receive instant notifications if they become unexpectedly accessible from external networks.
- Perfect for PCI DSS, HIPAA, SOX compliance requirements where internal services must remain isolated. Monitor from multiple external locations to ensure your security perimeter remains intact.
Wait, there's even more
Continuous certificate monitoring
SSL certificates are essential in website security. We check all your certificate expiration dates & alert any change we detect.
Performance monitoring
We provide highly detailed performance monitoring and insights. We'll notify you as soon as we detect your website is getting slow.
Fast and insightful notifications
Get notified instantly as soon as we detect an issue or an important change. Enable any channel you use, you're in full control.
Scheduled task monitoring
Your cron jobs (Linux) and scheduled tasks (Windows) are the heart of your data processing. We can monitor every single one of them.
Broken page & mixed content
We crawl and index your entire website, just like Google. As soon as we detect a broken link on your site we will let you know.
DNS record monitoring
Receive a notification whenever your DNS records are modified - intentionally or maliciously - so you can act and verify faster.
Application health monitoring
A lot can go wrong inside your app and server. Disk space may fill up, or the database may go down. We'll notify you when something is off.
Beautiful public status pages
In times of crisis, a public status page allows you to communicate to your clients. We'll host your status page so it's always available.
laravel.com
ign.comtakeaway.comWebsite uptime monitoring
When your website goes down we'll let you know instantly. Now you can act before your or your client's brand reputation takes a hit.
Domain monitoring
We can check how long your domain is still registered. If your renewal date is close, we'll notify you. This will avoid you losing your domain.
Lighthouse SEO monitoring
We track the speed & performance of your website over time. If we detect your website is suddenly slower, we'll let you know.
Sitemap monitoring
Elevate your SEO strategy and optimize your site. We analyse your sitemap health and check every URL for broken links.
Describe what you want to monitor
AI monitoring
Use AI to verify anything you want on your websites and services with Oh Dear's AI monitoring feature.
Start monitoring instantly
Start a no-strings-attached 10-day free trial. You're all set in less than a minute. (No credit card needed.)
Not convinced yet? Need help? Get in touch via [email protected].
