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IIS cannot serve pages ending with .config

Answer 1

+1 A:

In IIS 7, this can be found under Request Filtering. Other extensions that are filtered by default include:

.asax
.ascx
.master
.cs
.csproj

etc.

It's not a bug BTW, because the request gets filtered before ASP.NET gets a chance to process it. In other words, you could remove the request filter and have IIS process the extension if you want to, but make sure the extension is handled by ASP.NET and not the static file handler.

Edit: Maybe the answer for SO would be to change it so that when tags have a .XXX extension like web.config, they change to web-config or something else that IIS doesn't filter. This probably also would be a good topic on http://meta.stackoverflow.com/

Keltex 2010-06-07 12:54:37

Although there is no error for e.g. .cs but for .config on SO.

0xA3 2010-06-07 12:56:18

@0xA3 - If you enter a url like this: http://stackoverflow.com/questions/tagged/web.cs (or with any of the above extension) you get the same error. It just so happens that web.config is a popular tag.

Keltex 2010-06-07 12:58:20

I actually don't get the same error. For .cs and .vb I simply get a blank page, for .config I get an XML parse error.

0xA3 2010-06-07 13:01:00

Answer 2

+1 A:

I believe this has been addressed in ASP.NET 4 with the addition of a new web.config setting

<configuration>
  <system.web>
    <httpRuntime relaxedUrlToFileSystemMapping="true"/>
  </system.web>
</configuration>

Phil Haack has more details.

David G 2010-06-07 13:54:06

Very useful. Thanks.

zaph0d 2010-06-07 14:02:57

Actually this won't work. Per the article, "Please note, that you still can’t request /web.config because that would try to request web.config in the root of your web application and ASP.NET won’t allow that for good reason!"

Keltex 2010-06-07 14:13:50

@Keltex correct, as stated in the article, it wont work for the root web.config file for obvious reasons but it will work for URLs containing 'web.config' that match a route such as the question's example http://stackoverflow.com/questions/tagged/web.config

David G 2010-06-07 14:54:13

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