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My site is on a shared host and I need to do some maintainance work, which needs downtime.

For SEO reasons I need to cause a 503 http response to be sent to clients.

How can I do that from my web.config file (or any other method?)

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When you use the built-in IIS functionality of the "app_offline.htm" file in the root of the web site, all requests will service that page, and it will return a 503.

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