Web site does not show ( Says its down) , no user code is called

The site loads app_offline.htm.

The application used to load fine, im not sure whats wrong and im looking for a pointer. Its failing to load on the application. This hosted on the development asp.net server

To get this call stack i have to enable A first chance exception in System.Web.HttpExecption, here is the "console" output

A first chance exception of type 'System.Web.HttpException' occurred in System.Web.dll

A first chance exception of type 'System.Web.HttpException' occurred in System.Web.dll

Additional information: ASP.NET Initialization Error:

A first chance exception of type 'System.Web.HttpException' occurred in System.Web.dll

Additional information: ASP.NET Initialization Error:开发者_运维技巧

The call stack for the first execption.

System.Web.dll!System.Web.HttpRuntime.CheckApplicationEnabled() Line 1269C#

System.Web.dll!System.Web.HttpRuntime.FirstRequestInit(System.Web.HttpContext context = {System.Web.HttpContext}) Line 579C#

System.Web.dll!System.Web.HttpRuntime.EnsureFirstRequestInit(System.Web.HttpContext context) Line 652C#

System.Web.dll!System.Web.HttpRuntime.ProcessRequestInternal(System.Web.HttpWorkerRequest wr = {Microsoft.VisualStudio.WebHost.Request}) Line 1582 + 0x9 bytesC#

System.Web.dll!System.Web.HttpRuntime.ProcessRequestNoDemand(System.Web.HttpWorkerRequest wr) Line 2270C#

System.Web.dll!System.Web.HttpRuntime.ProcessRequest(System.Web.HttpWorkerRequest wr) Line 2256C#

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The presence of 'app_offline.htm" in the root folder will prevent the app from running. Rename the file and it should allow your app to load.

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Is it set up as an "application" in IIS? With the correct .NET version and all that?