Windows Server Management
IIS: The Windows Web Server, Taken Seriously
IIS is the web server built into Windows Server: application pools for process isolation and recycling, modules for authentication and URL rewriting, and integration with the Microsoft stack (ASP.NET, ADFS-facing frontends, ARR-class reverse proxying). It deserves better than its stereotype as a clumsy Apache substitute; its real limits are architectural, and knowing where those bite makes it manageable.
Key points
- Application pools are the core organizing unit: each pool is a w3wp process boundary with its own identity, recycle settings, and pipeline mode; standard sizing practice is one pool per application, since recycles crash-isolate without taking down neighbors.
- Recycling needs governance: default periodic recycles (often 29 hours) exist to mask leaks, but they cause unexplained session drops; tune recycle times, AlwaysRunning preload, and idle timeouts deliberately rather than accepting defaults.
- Modules carry configuration: URL Rewrite, ARR (reverse proxying), Windows/Forms auth, and Let's Encrypt via ACME modules; mirror Apache's common modules with IIS modules, but watch memory because module stacking is how IIS boxes bloat.
- The reverse-proxy shape is legitimate: ARR in front of one or several IIS web farms mirrors nginx-as-proxy patterns; where the traffic is mostly static or API reverse proxying at scale, nginx or a dedicated LB wins on cost and simplicity.
- Configuration is XML under the hood (applicationHost.config plus web.config); configuration transforms and seed data publish fine through CI, but config fight between hierarchy levels is real; keep a single source of truth where possible.
- Performance shortcuts: output caching (kernel-mode where possible), compression (static compression prewarming), WOFF/Brotli modules, and ARR cache rules; SSL/TLS settings follow the Windows cipher suite story (TLS 1.2/1.3 via registry or crypto policy), which is where most auditor findings come from.
Field note
An IIS box we inherited had application pools recycing on the 29-hour default, which meant every customer logout ticket belonged on a calendar. Setting AlwaysRunning and honest tuning stopped the tickets; the client thought we found a bug. We found a default.
Frequently asked questions
Should IIS sit behind nginx in a hybrid stack?
A common, verified pattern: nginx terminates TLS, serves static files, and reverse-proxies dynamic requests to IIS app pools, combining edge efficiency with Microsoft application integration; extra moving parts need monitoring from the same dashboards.
Is .htaccess-class flexible config available?
IIS uses web.config with URL Rewrite rules and IP/security restriction sections at directory level; equivalent behavior exists, but IIS config hierarchies differ and the rewrite module syntax must be learned separately.
What causes random logouts on IIS apps?
Usually recycling paired with in-process session state or scaled-out farms without sticky sessions/machine key alignment; the fix is configuration (session state server or AlwaysRunning), not mystery reboots.
How does it compare with Apache and nginx overall?
Where the application is .NET on Windows, IIS is the coherent option; for Linux estates and edge/proxy roles, nginx or Apache are the honest choices per our web-servers comparisons.
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