Documentation

A reliable web application monitor combines DNS, HTTPS, status codes, and content validation because HTTP 200 alone is often misleading.

HTTP and HTTPS monitoring validates more than port reachability, including status codes, 4xx and 5xx failures, and expected response content.

Expired or broken SSL certificates can take websites and APIs down. Certificate monitoring helps catch HTTPS risk before users notice it.

DNS monitoring catches wrong answers, unexpected IP changes, and domain resolution issues that can break websites, APIs, and traffic routing.

SMTP monitoring checks more than an open mail port by validating handshake behavior and whether the mail server responds like a real SMTP service.

Database monitoring should stay safe and practical, combining TCP port checks where needed with HTTPS health endpoints that validate real query paths.

Monitoring from one location misses regional failures and provider-specific issues. Multiple probes give a more accurate view of real availability.

Smart quorum consensus confirms outages by majority across contacted probes, reducing false alerts caused by one region or one broken network path.

Ping helps you verify reachability, latency, and packet loss quickly, so you can separate basic network problems from application failures.

Traceroute reveals the path packets take, the hops in between, and where latency or missing replies start along the route to a target.

TCP, UDP, and ports form the basis of network communication. This guide explains common service ports and the TCP three-way handshake.

IPv4, IPv6, addressing, and routing all affect service availability. This guide shows why A and AAAA paths can fail in different ways.

The OSI model becomes useful when you map outages and latency to real layers, from connectivity and routing up to TLS and HTTP responses.

Private infrastructure behind a firewall or VPN needs a different monitoring design, usually based on narrow public health endpoints rather than open access.