Sitecore Engineers

There is no dedicated Sitecore, Solr, or xConnect content in the archive yet — this is a real, acknowledged gap, not an oversight being hidden. Sitecore commonly runs on IIS and depends heavily on the web fundamentals covered elsewhere in this archive, so the three stops listed here are genuinely relevant prerequisite material while Sitecore-specific guides, architecture notes, and troubleshooting walkthroughs are developed in a future content batch.

Check back as the Sitecore pillar fills in — until then, the Sitecore topic page will show an honest, empty (or near-empty) state rather than anything padded out to look more complete than it is.

1. 1 IIS Application Pools: What They Are and Why They Crash  Guide · beginner
   What an IIS application pool actually is, why it stops or crashes, and how to tell the difference between an app pool problem and an application code problem.
2. 2 TLS/SSL Handshake, Step by Step  Guide · intermediate
   What actually happens during a TLS handshake, why certificate expiry breaks everything at once, and how to read the handshake yourself with openssl and a browser.
3. 3 HTTP Status Codes You'll Actually See in Production  Guide · beginner
   The HTTP status codes that actually show up in day-to-day support and operations work, what each one really means, and which ones point at the client vs. the server.

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