---
title: "Discussion on \"app_offline.htm in ASP.NET Core: How It Works and Why It Fails\" | Hashnode"
description: "Discussion on \"app_offline.htm in ASP.NET Core: How It Works and Why It Fails\". app_offline.htm explained from the ASP.NET Core Module source: the 503 it returns, where it goes, why it doesn't work, and a safe IIS deploy script."
url: "https://hashnode.com/posts/app-offline-htm-in-asp-net-core-how-it-works-and-why-it-fails/6af6efc4609744ab64f51bab"
---

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# [app\_offline.htm in ASP.NET Core: How It Works and Why It Fails](https://knowledgemarkg.hashnode.dev/app-offline-htm-in-asp-net-core-how-it-works-and-why-it-fails?utm_source=hashnode&utm_medium=feed)

app\_offline.htm explained from the ASP.NET Core Module source: the 503 it returns, where it goes, why it doesn't work, and a safe IIS deploy script.

37m ago · 17 min read · knowledgemarkg.hashnode.dev  
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## Written by

[Kausar Raza](https://hashnode.com/@knowledgemarkg)

@knowledgemarkg

  
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Freelance web developer: Next JS, ASP NET Core, site speed and technical SEO. Real errors, real fixes.

Freelance web developer building fast, search-friendly websites for small businesses in the UK, US and Europe. I work with Next JS, React and ASP NET Core, and write about the real problems I hit: Core Web Vitals, caching, IndexNow, technical SEO. Original posts and free tools at knowledgemarkg.com

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