Why Does App_offline.htm Keep Appearing In Web Project

Jan 27, 2010

I regularly (every few days or so) publish my ASP.NET web project to the local web server.

But the weirdest thing keeps happening... a file called "app_offline.htm" keeps appearing, unbidden, in my web project!

I have deleted this file several times, it is not in source control, and AFAIK nobody else is tampering with the project. But practically every time I try to publish the project, my publish fails (Unable to add 'app_offline.htm' to the Web site. The file 'app_offline.htm' already exists in this Web site.Error: The operation could not be completed. Unspecified error), I go back to look at the project, and there it is again, large as life, and I suspect if it could it would be blowing raspberries at me.

Having read up a little about this file, I gather it's meant to be an easy way to take your app offline. But I didn't see anywhere that it's supposed to impose itself on you arbitrarily for no good reason.

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