Real-Time Monitoring

Microsoft IIS
Monitoring

App Pool Health, Request Queues & Connection Tracking

Keep your ASP.NET applications running smoothly. BigBell monitors IIS application pools, request queues, and connection limits to ensure your Windows web servers deliver maximum performance.

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Overview

What is IIS Monitoring?

IIS (Internet Information Services) monitoring is the dedicated tracking of Microsoft's native web server performance metrics. This specialized monitoring goes beyond basic process tracking to integrate with IIS Performance Counters. It tracks Application Pool states, the length of the HTTP request queue, active connections, network throughput via IIS, and HTTP response error rates (like 500 Internal Server Errors).

Why IIS Monitoring Matters

A slow IIS server is usually caused by an overwhelmed Application Pool or a clogged request queue, not just high CPU. If your ASP.NET application takes too long to process requests, IIS will queue incoming traffic. Once the queue is full, IIS drops connections and returns 503 Service Unavailable errors. By monitoring IIS directly, you can detect queuing, application pool crashes, and rapid recycling loops before users experience downtime.

✓Detect application pool crashes and infinite recycling loops
✓Identify clogged request queues before users get 503 errors
✓Monitor active concurrent connections to scale web farms
✓Correlate IIS performance with underlying Windows CPU/Memory

Core Use Cases

Critical for hosting enterprise ASP.NET Core applications, Exchange OWA interfaces, and Sharepoint farms. Monitoring IIS ensures that web traffic is being served efficiently and helps diagnose whether latency is caused by the web tier or the database tier.

Features

Complete IIS Monitoring Capabilities

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App Pool Status

Monitor the exact state (Started, Stopped, Recycling) of all IIS Application Pools to ensure they are serving requests.

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Request Queues

Track the 'Current Requests Queued' performance counter to see if your application is failing to keep up with incoming traffic.

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Active Connections

Monitor the total number of concurrent HTTP/HTTPS connections actively being served by the IIS web server.

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Error Rate Alerts

Trigger notifications if IIS begins throwing a high rate of HTTP 500 (Server Error) or 404 (Not Found) responses.

FAQ

Frequently Asked Questions

BigBell integrates securely with Windows Performance Counters and WMI to extract real-time metrics directly from the IIS worker processes (W3WP).

Absolutely. BigBell breaks down resource consumption (CPU/Memory) and performance metrics on a per-Application Pool basis.

A filling request queue usually means your application code (e.g., ASP.NET) is executing too slowly to handle the incoming traffic rate, often due to a slow backend database or a thread deadlock.

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