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Why does the 404 page not work in certain cases? (IIS, Classic ASP)

Explanation
In production and locally, the 404 page for my site works fine for the most part. A URL such as http://localhost:43424/gibberish_r3hjjnwef will return the well designed 404 HTML page that is in the website folder, and pointed to by IIS.
However when I change the this URL to http://localhost:43424/gibberish_r3hjjnwef... it gives the following "hard" error, whilst still claiming to be a 404.
Server Error in '/' Application.
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested URL: /gibberish_r3hjjnwef...
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.2110.0
I'd rather it still gave the 404 HTML page.
I thought maybe it was an outright invalid URL, but both http://www.bbc.co.uk/news/fdisdhfdu and http://www.bbc.co.uk/news/fdisdhfdu... give the BBC's nice 404 page.
Question
Is there anything I can do to improve this?
Relevant Information (happy to provide more if necessary)
Microsoft .NET Framework Version: 4.0.30319
ASP.NET Version: 4.7.2110.0
Language/Framework:C#/Classic .ASP

I'm not sure whether this is what you are referring to, but maybe try this out:
Go to IIS Manager -> Site -> IIS Error pages. On the right hand panel, there's a setting "Edit Feature Settings...".
The options there mean:
Custom error pages: Use the 'IIS error pages' as fallback for all failed requests (e.g. your 404 page set up the list behind)
Detailed error pages: In case of an Asp.Net error, shows the 'Asp.Net error page' ("Server Error in '/' Application." etc.)
Detailed errors for local requests etc.: Show the 'IIS error page' for remote requests, for local requests show the 'Asp.net error page' ("Server error in '/' etc.)
This is in place to effectively hide the detailed Asp.net error page (with the stack trace etc.) from external callers as you may not want to give them the details of your application. This is the default setting, where you should only see the 'Asp.net error page' when you call the invalid URL on 'localhost', but the 'IIS error page' (404) when you call the page from a different computer.
So, what you may want to try is to select the "Custom error pages" option ('IIS error pages' for all failed requests).

ASP.NET and IIS and MVC - site does not open

I have a web site and when I try to view/access through IIS(Default Web Site -> Search/Run Site -> Search *:80(http)) the site open.
But when I try to open/debug using Visual Studio 2010, the following problem happens:
Server Error in '/' Application.
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested URL: /help
If I am in home page(root "/") and I try to open any page, open the "Directory Listing"
What is happening ?

It sounds like the problem is in your routing (Route.Config). Make sure you change your routing to follow how your website is set up in IIS.

Fresh Windows + VS2012 = MVC3 Problems

I just recently got a fresh install of Windows 7 on a my PC running VS2012/VS2010. I have an MVC3 project that ran just fine before I pulled it onto this PC to run. The project still compiles on this PC and I can navigate through my site while running the app in studio (2010 or 2012), but when I tried to POST from ANY form in ANY view and pass an ID by means of the URL like this:
<form id="ScriptForm" action="/MyApp/ControllerName/ActionName/#ViewBag.IDNumber" method="post">
...
</form>
...I got this error. I did some digging and playing around to try to fix this, ultimately taking these steps to try to resolve:
Actually installed ASP.NET via the Windows Components form in Control Panel
Changed the application to use IIS Express
Well, when I changed it to run under IIS Express, I started getting a different error.
HTTP Error 404.0 - Not Found
The resource you are looking for has been removed, had its name changed, or is
temporarily unavailable.
Most likely causes:
The directory or file specified does not exist on the Web server.
The URL contains a typographical error.
A custom filter or module, such as URLScan, restricts access to the file.
Things you can try:
Create the content on the Web server.
Review the browser URL.
Check the failed request tracing log and see which module is calling SetStatus. For more information, click here.
Detailed Error Information:
Module IIS Web Core
Notification MapRequestHandler
Handler StaticFile
Error Code 0x80070002
Requested URL http://localhost:51596/MyApp/ControllerName/ActionName/1
Physical Path C:\CODE\MyApp\ControllerName\ActionName\1
Logon Method Anonymous
Logon User Anonymous
Request Tracing Directory C:\Users\cbarlow\Documents\IISExpress\TraceLogFiles\MYAPP
More Information:
This error means that the file or directory does not exist on the server. Create the file or directory and try the request again.
View more information »
It's almost as if it is not recognizing that this is a route and is trying to resolve the URL to a physical file (like 1.html) which obviously does not exist. But why isn't it "doing the MVC thing" and using the route? I have this in my global.asax:
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
);
}
And I know this is running because I can breakpoint it.
Specs:
Windows 7 | Visual Studio 2010/2012 | Microsoft MVC3 | IIS Express
I've read all these SO posts, none seem to apply in this situation or do not help (mostly, because they apply to actual aspx pages, where I am trying to load pages via controllers):
The HTTP verb POST used to access path '/' is not allowed
The HTTP verb POST used to access path is not allowed
The HTTP verb POST used to access path '/Membership/user/' is not allowed
The HTTP verb POST used to access path '/Main/[object Object]' is not allowed
The HTTP verb POST used to access path '[my path]' is not allowed
HTTP verb POST used to access path '/' is not allowed in Facebook app
Any ideas?

The problem is here (due to my lack of experience with MVC/CSHTML):
<form id="ScriptForm" action="/MyApp/ControllerName/ActionName/#ViewBag.IDNumber" method="post">
...
</form>
The MyApp used to work on my PC (I'm honestly not sure why it doesn't work now... maybe I had set something up for that name to resolve before?) but it no longer maps to anything. It DOES work on the server, but that's because there is indeed a mapping for "MyApp" in IIS. Simply changing this form to this:
<form id="ScriptForm" action="#Url.Content("~/ControllerName/ActionName/" + ViewBag.IDNumber)" method="post">
...
</form>
...does the job more elegantly and without errors.

Browser Error when i run MVC3 application

I am getting an error on my browser when i try to edit or delete it says:
Server Error in '/' Application.
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested URL: /console/Delete/PS3
But the strange thing is when i put my mouse cursor into the browser address bar and press enter the delete and edit page appears
Can you please help me with this. If you need any information regarding this just let me know and i will provide.

Check if you have added routing for "/".
In most cases it is because of omitted routes.

I guess it is because the related actions has [Get] attribute defined on them, so add [Post] attribute should solve the problem.

View as start page

I don't know about ASP.Net at all, I right click on the file Index.cshtml in views and accidentally choose "Set As Start Page"
Now when I run the application (Ctrl+F5), the error occurs
Server Error in '/' Application.
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested URL: /Views/Home/Index.cshtml

You can change the settings in the Project properties, this other stack article should help: Visual Studio ASP.Net MVC undo set as start page action